Lifetaker

I am playing on my hard mode file and I really don't know what to do with my pairings right now. Sumia is already married to Frederick so I can't change that (they are the only ones that are married). I was stupid and forgot (a few times ^^') that I had to keep Chrom away from F!MU so that I could marry him to Olivia so they have C support now... The only way I can get him to marry Olivia is to marry MU to someone before I start the chapter or to have Chrom marry Sully or Maribelle. For now the pairings that I'm going with are: Sumia X Frederick Nowi X Donnel Cherche X Lon'qu Tharja X Gaius Lissa X Ricken (?) I want to get a Morgan with good magic stats so I am thinking about pairing MU with either Henry or one of the gen 2 kids. Putting Sully with Chrom is also an option, but I don't know if Kjelle and Lucina will end up OK... I'd really appreciate it if someone could help me out :)