Legal Question in Family Law in Missouri

If you are talking about rights to get child support from the biological father, you will not likley be successful in getting the name changed without his consent. If you are talking about what happens if you and the step dad split up, the name change may alster the child's future custoday a bit. The step dad might get visitation or custoday somewhat like a biological dad would. This can happen even without the name change. But, it seems like it would be a stronger argument with them sharing the name.

Good luck