Help is appreciated

I'm so sorry Adi. You can always walk alone, with your partner, or with just your mother if you want to avoid any possible hurt feelings between your step father and grandmother, but you should do whatever YOU want to do.

I think that it's more than normal to have your step-dad walk the bride down the aisle. I would of course bring it up to your grandma, but at the end of the day it's about what you want. Do you want your Step-Dad to walk you down the aisle to your FH? Would you rather have your Mom walk you down to avoid tension (if there is any)?

I would suggest talking to your grandma, she might not be expecting to even walk you down the isle as your stepdad has been around for a number of years.

Have you asked her what she thinks? I think if you tell her how you're feeling, she might understand.

Adi, you need to do what you feel comfortable with. I am so sorry that your biological father can't be with you on your wedding day, but if you're close enough to your step-father and you want him to walk you down the aisle, then please go ahead and do it. Don't worry about hurting your grandmothers feelings because it's really your choice and you need to be happy with it.