I may be being utterly ridic here so bear with me...
I was at a family wedding a couple of weeks ago and noticed my mum kept glancing up at my partner, before the wedding I asked her if she knew how to do a tie, she said no, but when I walk away goes up to dp and says let me have a look, then as I walk back walks away from him. I understand this could sound mental and I'm not saying there is anything going on between them I just feel a bit 
Yesterday dp strolls in from work and goes "who's been buying your mum gifts" as she uploaded them on Facebook, he also asks about her partner and if they are getting on (because normally he's a complete dick) . I just said what's it to you why do you care?
Am I being stupid?