My YSS was a great athlete and was a member of his high school football team, he was a receiver.  We were proud of him, he did well and he was proud, too.  His "career," actually started at about age 10 when he played for a youth league.  I think BM finally showed up for one varsity game in his senior year.

Who have more important things in there life. Drugs booze or total mentally screw up. And all of above.  These people are not real people 

Ever, for anything.  Not award ceremonies, not HS graduation, not graduation from basic training, never visited him a single time in his real life, no graduation cards, not one call just to speak with him. Not one.  At best whoever called to rage at my DW would speak with SS when DW shut them down and asked if they wanted to speak with their GS, or son.  Even that was rare since DW had invariably bared their asses and shredded them when they started cursing her and banshee shrieking at her.

As sad as it is that they plied that crap for 16+ years of SS's childhood it ultimately made reality very clear for him and ultimately resulted in him writing them off from a place in his life. 

As irritating as it is that BM does not give a shit about her kid, ultimately it is better for the kid that there is little to no involvement from a toxic parent.  Congrats to your SS and his robotics team.

IMHO of course.