Ok first off if hes a family friend you will probably get caught cause not only do you have to lie to him but your parents also which make you story options very limited. That being said food poisoning is always a good excuse because its only like a day long and can strike whenever, bring in some sushi for lunch to and make sure your teammates see you eat it.
you could also do something painful like smash your knee off something hard enough to get it to swell up, can't play with a swollen knee and ice will fix it in a day or two. that works with the rents too because theres no reason you can't go to a concert with a swollen knee. nbd