I personally am of the mindset that the purpose of middle names is to honour someone, and if I wasn't going to have a name with some connection or meaning, I wouldn't bother having one at all. I know others choose them just based on names they like which is totally fine of course, but this isn't for us.
Our daughter's middle name is the name of a very close friend who passed away the same day I found out I was pregnant. Straight after doing the test, we agreed if it was a girl this would be her middle name.
Therefore it didn't feel so much like we were choosing one side of the family over the other. I am pregnant again and this will be our last child. We are thinking of middle names from both sides, but I have a feeling my mum or mil might be upset if we opt for the other person's family. Our surname is double barrelled for both of us and the kids, so this is already balanced. We do not want to use a family name as the first name, we've got a boy and girl name picked out.
How have others dealt with this?