How to rebuild/fix family issues

I have 5 generation's of the Reed Family - and family tree is bit messed up right now

1. John daughter Alison got deleted (somehow) she was the eldest child from his wife (no longer existence lol)
2. Alyson Son - Mark Reed is still in the family and says grandson of John and his father Neelash Meshram and mom (Alyson reed) is missing :(
3. Cynthia Reed - i went and made Johns mom last month and had no issue linking him and his sister to her as parents of Cynthia.
4. Stewart Reed - so when i try to make parent of John Reed his dad - his mom and Stewart show married but says John Reed is a step - son and so his sister Lizbeth and Kristen - how can i fix this issue?

So what is my best option here?
A. Remake Alyson Reed and have science baby or try to link Alyson with the existence Mark Reed? cause i dont want to delete Mark, because him and John have a good relationship - its says Grandpa lil boo

B. how can i fix the issue of the step father to his kids? as i dont know how to clone sims

As im trying to make complete family elder grandparents with (frst gen) 2nd Gen - John/lizbeth/kristen - 3rd gen the kids of all siblings etc

If somebody can help[ me sort this out i would be greatful