Would you leave your son?

I’m a single mum currently 26 weeks pregnant been offered to go to Scotland next weekend with my mum for a trip so Friday early til Tuesday late night coming from Devon so it’s a fair journey, my other sons dad offered to have my son Friday Saturday night & my dad the Sunday Monday Tuesday. But I’m abit worried about going I know they all love him but like with my dad he can be abit ruff and thinks he needs to “tuffen him up” he’s 2 almost three and he gets stressed really easily, my son does love being with him but ultimately he’s a mummy’s boy. I’m really unsure wether to go it’s a free trip & a brake before the new baby comes but at the same time I don’t know if I wana leave my other baby help!!