How do Alan3 and Jerk manage to provide for so many children and take care of them at the same time? Who stays home, who works, how/where do they live, etc.?
Given how busy they always were with recording/touring/press/filming/etc. I fully believe that they found a way to intricately weave child rearing into that schedule so the kids were more or less raised on the road as a result. (A lot of them were born during tours so those babies born on the road also being raised on the road is not that far of a stretch.)
Obviously they have their own homes and extended family that helps out whenever they can, but when literally every member of the band is a parent to those kids, it just makes the most sense that the kids stay with the band. The spudlings are used to moving around and probably have a tutor or some variation of homeschooling to provide their education (raising their kids to be smart and independent is something that would be extremely important to all of them obviously). They are financially provided for by their parents' tours/record sales/residuals etc (the only kids that they really needed outside help with in the capacity are the kids born in devo's early days such as Arlo). During tours and gigs, they most likely have nannies looking after their kids.
But to be fully transparent with you, I didn't give these guys so many kids for any deeper reason and I certainly wasn't focused on the plausibility of them having so many because this all just started as a series of silly roleplays with my partner. We just kept making more spudlings and at this point they are all individually so precious to me that I wouldn't dream of removing/retconning any of them. (I mean because if you REALLY wanna be realistic, Mark and Jerry would probably go as long as they can without having a kid, let alone 6 of them)
The real challenge for them I think is the matter of trying to spend as much time with all of them as they can and in that case, I think they all kinda take turns being with the kids to ensure that no one's left out and no one's getting all the attention from one specific parent.