Snorris
I am praying for you

You sound stressed. I know how you are feeling. Can you husband help with anything? Just curious. I know with my husband, I used to have him listen to the kids read out loud in the evening. At one point all 3 of mine were still learning how to read and reading out loud a lot and I was overwhelmed

Also, we have moved to cleaning on the weekends mainly. This way, everyone (hubby included) helps. It only takes a couple of hours and that makes it doable. Plus, I make the kids clean up twice a day - before lunch and before bed. Maybe your kids could clean up starting at 11:30? And then if you set another time, they could clean up again. If it were me, I would also move to making the lunches to the night before so you can just warm something up quickly or get something out that is already prepared. And for breakfast - we mainly eat things that my kids can get themselves. My kids are a little bit older. Sometimes I make muffins or loaves of bread (banana bread or zucchini bread) the night before. I just leave it out over night and it is ready to go the next day. Sometimes I make an egg casserole and I cook that in a crock pot on low for 8 hours overnight. My kids can get that on their own as well. If they want eggs, I can only make those if I am not working. But my kids usually eat eggs at lunch - in a tortilla or on bagel. We also keep lots of yogurt and bagels on hand here too - my kids love that. And fruit, dried fruit and nuts. Easy healthy snacks the kids get alone. And as for my work schedule - it flexes some but I mainly work from 6AM - 10AM most days and then for a couple of hours in either the afternoon or evening as well . I work about 6 hours a day but have a hard time setting a schedule because I get a lot phone calls throughout the day and that makes it hard to get stuff done all at once. And I am not sure how long you have worked from home but I have been doing it since my 2nd child. So after 8 years, I finally feel like I am in a groove that works for us
As for together or not for you kids, if you oldest is a great reader (sounds like she is) she would be a great candidate to complete the extensions as she gets older. However, you may also find that as she gets older, the gap between her and your younger child gets bigger too. Kids are all so different! I could never school my oldest and middle child together because my oldest would leave my son in the dust in learning. Because all of my kids are so close in age, I actually tried schooling them all together at one point and it was an epic fail! My middle and my youngest could definitely be schooled together but what I find is that my middle child will always look to see what his younger sister is doing and he won't do stuff on his own. If my youngest wasn't so advanced, then I would probably have schooled both her and her brother together. But my youngest is gifted and can do anything her brother does and usually better so I decided not to school them together. Last year they did do Beyond together and so instead of letting my youngest bump up to Bigger with her big brother, I put her Little hearts for the year. Next year and each year thereafter, they will end up doing back to back guides and I am okay with that.
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Above is a link for post Carrie created about some frequently asked questions. It discusses a lot of topics that are probably thinking through right now with your decision.
The one thing I would consider before making a decision is the question, would you look to combine if you weren't working? If the answer is no, then I wouldn't combine. You mentioned that your are only working part time from home for a period of time and that there is a near end in site. For me, I will probably always be working from home unless some things change drastically. If you are only planning to work from home till Nov, I would probably just continue on for the next couple of months with the track you have for your oldest and then add the next guide when you finish working for your youngest.
As for listening and comprehension, there are a lot of things you can do to help encourage it. My son was horrible!!!!! He could barely tell me what I read in 3 sentences. He does so much better now. I found that my kids like to move so they sit on exercise balls when I read and bounce the whole time. I also have a bosu ball that they jump on. My son, now, likes to lay on my bed upstairs while I read and that works well for him. He rolls around and moves the whole time but he likes being in there. I think he likes this best because it is just him and I in the room together only. I wonder if that could be part of the challenge, that your youngest is distracting the oldest? That was a huge probably for us until recently. I also don't wait until the end of the reading to ask questions or discuss things. It turns out that my son has auditory processing disorder and I didn't learn this until recently. He has been through many therapies for years for things that are side affects from APD but there isn't really anything you can do for APD except constantly engage your kids. I find, that when I read, I engage both my oldest and middle child the most to keep things moving smoothly for them. A lot of times when I am reading, I will read a page (or even a few paragraphs) and then we talk about what just happened. We keep a running story going verbally right after we read the story. Ever time we see a picture in the book, we talk about the pictures too. I just try and engage as much as possible. That has also helped tremendously. With her age, and her enjoyment of reading, I don't think you have anything to worry about. I also didn't realize with my son that because he has APD, he only struggles with listening to me read and that is only because I am reading it out loud to him. If he reads it to himself, then he actually comprehends most of it. Hearing it and comprehending is a still necessary life skill but I am not as panicked as I used to be. Now we work on hearing it, him telling me what was important and him keeping the story going the entire time. It definitely takes longer in those boxes but that is okay. He really enjoys me reading out loud now. And when I read out loud to him, it makes him feel good to have a job and a goal that he is working toward while I read a story or even the history or science.