MCA: how to discuss it

So my mom, who is a single parent, has some new lovers, yes, lovers, kasi ang dami nila, omg, well, wala naman akong problem since u know, buhay nya naman yan, but parang nakakalimutan nya na responsibility nya like bigyan allowance anak nya. What to do? im planning naman to talk to her pero di ko alam pano simulan.