Divorce wife after 18 years asking compensation / share in property

I divorce my first wife in 1999 from whom i had 1 son which was with her. I have no legal documents for divorce from court since the matter was solved by the community / village peoples. Then i married to my second wife from whom i have 1 son and 1 daughter. Now my ex- wife after 18 years asking for her son compensation and share in the property. I need to ask u the following points related to it. 1. I am a muslim . 2. Do i have to pay any compensation for the son which was in his custody for 18 years. If so then how much amount. 3. Do i have to give any share in my property if so pls. conform. pls. give all related points answer in my email by taking into consideration that the child is now18 years old.