Inheritance Laws and Rights?

Not unless she mentioned it in her Will or it was in your Father's Will that a part of the proceeds from selling the house will go to you. Otherwise, it goes to her own next of kin.

Things might differ from country to country and here in the Philippines, children will automatically inherit their dad's property, whether they are legitimate or born out of wedlock. I think this is a common law worldwide. It will be good though if you consult a lawyer or solicitor. But if you have enough time, you could do your own research, it may not be very difficult.

Well that would depend I think on #1 what was written in your fathers will and #2 what was written in your stepmums will....best bet, contact a lawyer