Mother of three, business owner here. 

Personally I treat it like a job. I have a posting schedule I stick to and act like keeping up with my posts is the same as brushing my teeth, getting the kids on the bus, or filling an order. 

Just as I have responsibility to my family to take care of this or that, or a client pays to have an order filled - I give my word to post regularly; I do it. 

To find balance, I plan out. I have a schedule, I multi task, take quick notes so when I need to reply I am ready and not trying to read huge blocks to push out a post before bed, I write down ideas that pop in my head randomly.

It all works to make it easier to keep up. Kids, work, 6 rps to gm. It gets done. Granted, I have been at this over a quarter of a century. Trust me, it gets easier over time.