firstly, you may need to ask yourself why your mum never pursued this when you were growing up. Secondly, you need to cnsider the consequences of getting in touch with your dad (assuming you can) do you really want to let this loser into your life? soeone who didn't even want to meet you?
Thirdly, i dont know if what you are suggesting can be done (although something is telling me it can't), but anyway the mony would have been due to your mum, not you. Does she want to stir it all up?