I started laughing to myself and thought "God help you" as soon as I read your title. They get worse. You thought they were bad when they were busy working full time well prepare for them to ram up the interference. We are low contact with my in laws due to their interfering and generally not being able to treat their adult son as well, an adult. They won't communicate with me anymore (shame) but still hound my husband. They message him and if he doesn't reply he gets another message, then a phone call, when he doesn't answer he gets an arsey voicemail. My husband has a job where he isn't contactable during the working day, they know this, yet continue.
They have nothing to direct their time and energy into, they were both senior managers prior to retirement and were used to being in charge and having people do as they say. We aren't playing ball and just want to live our life quietly and privately, they in their own words are "frustrated" by this lol!
My mil messaged my husband last week begging to be "involved" in our family life and wanting to help. She wants to wait for it... Wash and iron my husband's clothes, do his food shop and cook. Not my washing, just his lol. He's 36, has a wife and 2 arms of his own, we have a fully functioning washing machine, my husband irons his own shirts for work, takes all 5 min. She thinks he's hard done by having a wife who won't iron for him, hilarious. My mil needs to be involved and star of the show, she wants to basically mother her 36 year old son. I find the whole thing bizarre and amusing. Since she retired last year she's just got worse, I wish she'd get a hobby and leave us alone.
I wish you luck with your mils retirement 😬!