What if Lincoln loud is actually adopted by the loud family?

What if he is actually Moon and River's long lost son and Star's younger brother who disappeared when she was three.

What if an incident caused him to gain his symbol's on his cheek and activate his magic?

Be sure to ask any questions about it and/or to clarify anything

This is an open idea if any of you want to write about this then ok

If someone is writing a story of this idea then you can as well as long as it's different