Ds is 12. Ex left whilst pregnant. Never wanted to anything to do with ds, to the point of moving abroad when ds was a baby to avoid paying maintenance. Never had any direct contact with ds and never paid so much as a penny in just under 12 years. Ds knows who he is and in his own words thinks that ex is an "arsehole". Im not prone to disagree. Ex is not a bad person, just a irresponsible feckless wonder. Obviously has changed tune in recent years as he has expressed a half hearted interest in having something to do with ds, but since ds doesn't want anything to do with him, im not going to force it. Anyway had contact from a relative stranger/third party to say that ex had given them a fiver to pass on to ds. Didn't take it. AIBU to tell ex next time i see him to shove fiver where sun dont shine?