You must begin the name change process within the first year of marriage.
- School records
- A note to each teacher personally from you
- Coaches, gymnastics, dance all need to know that the last names maybe different and they need to know about the legal union
- POA Medical for the step-parent is important
- Custody paperwork and visitations
- Health and life insurance, Medicaid, and touch base with the school counselor so they know if the change in family dynamics.
Here is a story I lifted off the internet which may help you to decide what you want to do.
weddingwire.com/wedding-forums
I've heard that having a name that differs from your child's can make things difficult, requiring papers for proof of parenthood for things that you normally wouldn't need it. With that, my mom had children in two different marriages, so we had different names. She hyphenated her last name, so she can both names of her kids. I think that would be the easiest option. I know not everyone likes hyphenating names, but it would also be a nice way for your son to know that you're still connected to him, no matter what.