Most countries have legislation regarding inheritance. You would need to speak to a lawyer about what the laws are in your country.
You can inherit property from your mother-in-law if she mentions you in her will by leaving a gift. If she dies intestate, or without a will, you are not her legal heir.
look at their pupils
The biological child.
Not nearly enough information is given. If the "estate" being referred to is the 'estate' of a deceased parent(s) the siblings have only as much authority over the estate as the will of the deceased allows them. They each inherit individually what the will gives them, and if they inherit anything jointly, they cannot do anything with their joint-inheritance without BOTH being in agreement. It sounds like the questioner needs the advice of an attorney.
Being born out of wedlock does not bar a child from inheriting from his deceased father. However, if the father left the child out of the will then that child might not be able to inherit anything without contesting the will in court.
You could inherit it.
No.
no
They can go into 112 without leaving a remainder.
You can't. And shouldn't.
you can't.
No it is not