Peanut: think the norm is for own mother to do. Unles u r very close to yr MIL or if for some other reasons like mom working/NA. Cos u may be quite emotional during the period n if in pain etc wouldn't u prefer yr own mom? Also some ppl have conflict with person helping. My friend even 'fired' her mom halfway thru cos couldn't agree how to do things. Hard to fire yr MIL. Mom will forgive, if MIL think mine will remember forever.