My 16-year-old son impregnated a 15-year-old girl

My 16-year-old son impregnated a 15-year-old girl

I am a single mum and my 16 year old son has impregnated a 15 year old girl . He is even unapologetic, he said he wants to marry her that he loves her so much . The girls parents are insisting that he must marry her that they can never abort the baby. What kind of wahalah is this . What should I do ? I am still struggling , I can feed extra mouth and a child again , it will be too much on me.