DEAR ABBY: My husband and I have been married for a few months and are expecting our first child. His father passed away about a year ago. His parents had been married 33 years when he died. A few weeks ago, we told my mother-in-law we were expecting our first child. After a joyous moment and some conversation later about children, she brought up my husband’s half-brother, someone I didn’t know existed! My husband then said, “I thought we weren’t supposed to talk about him.” She told him my father-in-law had reached out to the half-brother before his death to ...