A few words of thanks takes no time at all. They are just bad-mannered. Allowances could be made for a few weeks after the birth, when they are adjusting, but not acknowledging wedding gifts shows just what kind of people they are. I wouldn’t bother again.
Most of my family don’t really like hand-knits, but my 21 year old GD, who is in a relationship but doesn’t plan on starting a family for some years, surprised me recently. I had been telling her about how girls, in the past, had a ‘bottom drawer’ and collected things t for their future marriage. She was intrigued with the idea, and asked me to knit a ‘bottom drawer’ for her future babies! She has probably realised that, as I am 82, I may not be there when she starts a family.
I was very touched by the idea, and have already knitted a blanket, matinee coat, hat, mittens and bootees - patterns all chosen by GD. She said that, once outgrown, some of them will go into a ‘memory box’, just like the one her Mum has done for her. A nice thought.