What should i do with him?he's being a bully to them!?

ok so i'm going on vacaition to my lake for 2 weeks and i don't know what to do with my betta he came with us on the last trip but we have a trailer and he was in my parent's room upstairs but everytime one of my sisters had a meltdown the whole trailer would shake and it would stress him out and i have another 10gal tank with approx.18 fry orted ages and i tried putting him in there but he just kept puffing out his cheeks and chasing them! so what should i do?