Melanie likens making mom friends to the different bases in dating. This is the chance encounter with other moms, usually taking place during your child's activities such as ballet or soccer practice.
You sit there with other moms while their kids are doing their thing and it's awkward and you feel like you should make small talk.
What I do find distasteful is that it is between a guys mother and his best friend and in the apartment that the friends share, it shows that they gave no consideration to the son/friend.
My first reaction would be to move out of the apartment, if they want to have a relationship fine but it does not have to be thrust into the sons face every moment of the day.
I have a small group of friends that I've known for a very long time. I've known 2 of them specifically since I was maybe 7.
If you don't know what to say, start by saying something encouraging about their child. This is when you intentionally choose to be at the same place at the same time with the other mom.
You meet at the park or some other neutral territory. Let's take our crazy kids and put them somewhere together on purpose." Third base.
Most of us go to the same college and are around the same age. One important one is that we don't date the siblings or relatives of the next friend without permission or at least asking.