Hey there, adventuresinorga!
Welcome to QuickBooks Online! *throws confetti* We're so happy to have you! I really think you'll love it :) I'm really glad you asked me this, because this kind of question has a couple different aspects to it.
First, depending on how your businesses are classified with the government, you may be legally required to keep two separate sets of books for the businesses. You may want to check with an actual accountant on this point, as I'm definitely not one, and I wouldn't want you to get into legal trouble based on something I said! That would be terrible.
Secondly, you'll want to think if your businesses are really two entirely different businesses, or is one a subset of the other? Think of it this way - my dad is a contractor who does both kitchen remodels and builds decks and patios. He could have one set of books for remodeling, and one for decks, but instead, they're all a part of the same overall contracting business. Conversely, your organizing business may not be a part of your daycare business...or it may be!
Finally, do you plan on sending invoices or sales receipts to your customers? We can only have one business name in each QuickBooks Online subscription, so if your businesses have different names, that may be a consideration.
So there you go! You can have two businesses involved in one set of books, but most people prefer to have separate sets of books to keep things easier and more separate. I hope this gets you what you need today, adventuresinorga!