pink
then stay at your mom's definitely better.
1 room for u & hb, 1 room for mom, 1 room for 2 maids & 1 room for your bb. It'll be more comfy for your mom too.
But since your hb is only child, u may need to ask your ILs to sound them out first. Some ILs are very particular abt such things.
The way i see it, even if your mom should shift over to your place now, when u have #2, you will need to shift back to her place coz no space. Esp if your #1 & #2 diff sex.