1. Could be anything....... . Father sisters-- sister in law ...  .......  Depends upon wether father sister is married or not, whether the sisters husband has sister or not......  tyasaile yo first question jpt bho

2. Definitely egg.  Dianosour used to live long before chicken . And dianasour used to give egg. That means egg came  well before chicken.

3. thrid question is easy. stand back to back.