Child care!

Mommas, when you went back to work after your LO who watched your child? I might be going back to work soon FULL TIME. my son is gonna be 4 in June which means he’ll hopefully be in pre k part time in sept. My dad (who’s 63) keeps offering to watch the him when he’s not in pre k. But I’d be dropping my LO off at 6:30am and picking him up at about 4. I feel like that’s sooooo much on my dad but he insists it’s okay. What should I do????