Oh, heck! The spoon licking is a very primitive 'fouling' to claim possession. A bit like a animal rubbing its bottom on a tree to claim it. So, it could be worse! I think you need to be pleasant but a lot less passive, infact see her as who she is,- the lady who just happens to be your MIL. It might help if you gently hold a 'mirror' up for her, at times. And 'Crikey, you'll cut your tongue!' &/or 'I'll get you a spoon' would change the whole knife in jar thing to daftness. It seems that she wanted to disrespect you to the point of frightening you but she may have misinterpreted you to the point of distress. A helpful neutral family member or friend and an afternoon cuppa and cake might work wonders to sort things out. If things are way beyond that, just go with being polite, kind but not a doormat. And hope, as we all must, that you stay nice in older age!
Hotel etiquette - has it been forgotten?
Heatwave Hits, songs to sweat to!

