How to involve everyone

You could have your dad and son both walk you halfway down the aisle, and then have your step dad and son both walk with you for the other half of the aisle! Otherwise, you could have just your son walk you down the aisle, but do two father-daughter dances to do one dance with each your dad and step dad.

I've seen a really unique way of having both walk you. You could have your dad walk you down and stop at the front row where your stepdad is and have your dad kind of invite your stepdad to give you away. It gives your dad the special moment of walking you down but also includes your stepdad, given that he's been fatherly to you as well! That way you don't hurt anyones feelings and it seems like a really sweet gesture!

Didn't see the son part! You could keep the walk down traditional with your dad, and then have them all give you way! Just add you son when you and your dad stop at the front row?! That way everyone gets to "give your way", and your dad gets to keep the traditional walk down the aisle - if that's what you're wanting!

I would do a father daughter dance where you dance with each one for a couple minutes in order of how they entered your life

Have your son walk you down the aisle then share a spotlight dance with both dads.

Maybe have your son walk you down the aisle, father daughter dance and have your step dad officiate or do a reading.

what if you did both your dads walking you down the aisle

I think having you son & dad walk you halfway then your son & stepdad turn rest of the way would be unique & beautiful.