I need mummy advice! So Roman is 5 months next week and the last 2 times I've taken him to my in…

I need mummy advice! So Roman is 5 months next week and the last 2 times I've taken him to my in laws house he's had complete meltdowns at granddad! He used to be his favourite person no one ever got a look in around granddad. Is this normal? Is it just a phase? I'm wondering whether he has associate him with me leaving because he babysits while me and granny go spinning glasses. Roman has been so so clingy with me at the minute to the point I can't even go for a wee or make a drink. What do I do? And is this normal?