Good heavens, tigergirl, get over it!
If my mum turned around and told my DH that she loved him just as much as me I'd be really annoyed and feel hard done by.
I adore my MIL, she is a great person, and I know she loves me. But does she love me as much as DH? Not bloody likely.
I have to be honest though, that at times I don't always LIKE my mother, because she has the ability to drive me batty in a way that no other person does. But loving someone and liking them are not always the same thing.
Face it, the consensus seems to be that mothers love their DCs more than their DC-ILs. You may not agree with us, but that's your problem.
What Anna says about mother's being close to daughter's, can be really true. My MIL is very close to my DH, but not a day goes by when she doesn't talk to two of her DDs. It is often 'easier' to share things with another woman. For heaven's sakes, what else is Mumsnet all about if not that????? And yes, if you love your own children more than your in-laws, then to go through the whole birth process with a daughter would be incredible.