O M G! My mother has patted Oskar's head when I was feeding him too!!! UMMM HELLO PERSONAL SPACE!! to you. I'd be feeling the same way you are if that was happening to me.
pmsl I had my Mum and Nan both up close and personal when I just had DD trying to help me get the attachment right, one of them even held a nipple shield on my boob, ahahahaha, or held her arms so I could attach her. It was pretty awkward but I was so over everyone seeing everything by then anyway so I didn't really care. Seems weird though.

I would be TOTALLY freaked out if my MIL did that though.