<human>: To begin, I am writing this on behalf of my SO, who asked me to, because he doesn't know how to use Reddit. I will not act on anything, decisions and actions on this are completely up to him.

My husband's mom, Janet, was married before my husband was born and had another son, Josh. Her and her ex-husband divorced before my husband, Paul, was born, but Josh was in Paul's life when he visited weekly until Paul was 8 or 9 years old. Suddenly, Josh stopped showing up, and he did not speak to Janet or Paul at all, until Josh recently messaged Paul on Facebook.

In the message, he just said he wanted to meet up with Paul and catch up. When they got together, they both determined they didn't really know why Josh stopped visiting, and that it was likely a fight/decision made by Janet and her ex-husband. It also turns out that Josh has a wife and a baby.

Josh said he is interested in seeing Janet again. Janet still speaks very fondly about Paul when we see his photos, but she doesn't really wonder what he is up to. Paul asked Josh if he could tell his mom Janet that they met up, and Josh said it was up to Paul. Paul is conflicted, because he doesn't know exactly what happened to cause Josh to stop coming over, he doesn't know if Janet will be mad, and because he knows that Janet is very excited to become a grandma (we are going to have a baby in the next year or two) and doesn't know how she will react to the news that she has a biological grandchild.

What should Paul do, tell his mom, or just leave it be (continue to lie by omission)? He is worried that it will come out that Paul and Josh met since Josh lives in the same city as Janet and it would hurt his moms feelings a lot to know that they met behind her back and that he lied to her.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Husband's estranged brother contacted him and they met up, didn't tell husbands mom. Don't know what caused the brother to become estranged. Husbands mom is a biological grandma.