Differences between Peter and Patrick

Being identical twins it is easy to mix up Peter and Patrick. In fact everyday it seems grandma and grandma take a wild guess to determine who is who.
When they were born it was a little easier because Peter was 200 grams heavier than Patrick but they are slowly starting to fill out the same. And in the beginning Peter had a few bruies on his nose but that has disappeared.
Some differences between Peter and Patrick.
Peter is the one who sleeps in the crib while Patrick sleeps in the bed.
Patrick seems to be the more social one and also the whinier one and the biggest and loudest cryier. When he cries he is most like to start crying at the top of his lungs at the onset.
Peter seems to be more easygoing and seems to only cry when necessary. And when he cries he does just enough to achieve his goal. Once he woke up early morning and nanny was in the washroom and mommy and daddy were sleeping and too lazy to get up. And first Peter gave a little whimper but to no effect and then he got little noisier but still no effect and that is when he let it out.