Even my own mother does it to a certain extent. She often doesn't believe me unless my bro does it, such as she thought her new microwave was broken and wouldn't let me reset it... "No wait until your bro has a look & he will fix it. ". So she waits over a week until my brother can come over, for him to simply reset it. 
Good job me and my bro are close, know what she's like and can laugh it off.
I have experienced similar, from opposite perspective.
Mum & Dad have both passed away now. But in their latter years, when they were fiting fit and 400 miles away, I was a few times pleased to hear my sister was visiting, so she could sort out some crisis like a printer error, or beeping smoke alarm, and specifically
microwave in funny state, whatever. Great, as it took the pressure of me to visit, and allowed me more free time when I did.
Sadly no. When Sister and I compared notes afterward, they'd not let her touch it. Save it for me to fix, they always said,
'I'd not mind'
