She seems to think that because she only lives ten minutes away she can just pop in to see them every week, only giving us a couple of day's notice that she'd 'like to come over and see the children for a few minutes if that's ok?'.
She's also suggested several times that me and DH should go out for a meal and she will babysit - as if I'd agree to a mad idea like that.
Last year, when I had DC3, I arrived home from hospital to discover that she'd hoovered the house and left a casserole and a shepherd's pie in the fridge. I felt totally invaded and just burst into tears.
AIBU to consider sending her an email explaining that they're our children and really have nothing whatsoever to do with her; and that if I need a babysitter I will, of course, be asking my own mother and not some random paternal grandmother?