Ok so I was able to marry Aela and get her as a companion. I did a little research and found out that if she gets a child or children, then she will complain about living in Whiterun, Riften and out of towns if the DLC is owned. For whiterun she says the house is too small for you, her and the children. For Riften she complains that the kid(s) will grow up to be thieves. Living outside of town she complains about the kids' safety and about the wolves and bears. (Despite the fact that we are both werewolves so the kids should be more than safe in the wild but whatever). Is there any town or towns that she won't complain about if she were to have children there?
Ok so I just did a little experiment. Used up the past 12 hours of my life to find out this information so I hope everyone finds it helpful. In whiterun Aela will complain that the house is too small for her and the children and you. In Riften she fears that the kids will become thieves (even if you are the guildmaster for the thieves guild but whatever). In Markarth she fears that the children will easily get hurt or wind up in the mines. In windhelm she claims the streets are crawling with filth and unsafe for the kids. In the heartfire home she gets mad at the dragonborn for moving them into the wilderness to get attacked by wolves, bears and giant spiders (AELA YOU ARE A FREAKING WEREWOLF WHY ARE A FEW PESTS SUCH A BIG DEAL FOR YOU?!). Solitude however she is completely fine with.