Need advice from Step Fathers/Fathers please

I became a stepfather to two girls at ages 12 and 22. The 12 year old had a hard time with it.Over time we gained respect for each other.Yes it was hard to say "no". I would give my life for these kids and my wife.They are the best thing ever in my life.
The girls are 26 and 34 now and have a life of their own. Still makes me tear up when they call and want to ask "Dad" for advice.............