calling a parents partner grandad?

[HelenHen]

A few months back my mil asked if I'd mind if my son calls her partner grandad. At the time, I didn't really think about it and just agreed but it's been annoying me ever since.

He's not like a Dad to my husband and I dont really like or trust the man. On top of that, both grandads are alive and well but both living abroad so it hurts me to know that he will only know one grandad who's not his grandad at all.

I'm pregnant with no. 2 and will not have the same agreement. Should I say something now or is it too late since I stupidly agreed in the first place? I don't want to hurt mil as she's wonderful but it does upset me a bit.

I took offence that everyone was told to call DPs Mothers partner Grandad. He's not. He's NC with all of his own DC. He's an alcoholic pot head and a two faced creep and was only on the scene once DP was about 30 so not a father figure to him.
It makes no difference, we are NC with them both now. They're weird and couldn't give two shits about our DC. In the 3.5 years that they existed while we did speak, they had never even asked about or visited our DC (except once after first was born) and allowed her cannabis smoking alcoholic partner around our DC with containers of urine and phlegm as he's too lazy to go to the toilet
She suggested to DP that he drive a 2 hour round trip to see her if he wanted her to see the kids and that she could come out to the van to say hello.
Unbelievable. My DF is an absolute angel and an amazing DG. That man does not deserve the title.