Congratulations for doing everything you can for the boys, they'll be so grateful later on in life.  What surprised me the most was that you're teaching them to swim during their teenage years. Did their parents never take them to the pool when they were little? Some of my earliest childhood memories were going swimming with my dad or older sister and I can't have been much older than 2 or 3 when I learnt. I guess the parents are too lazy or embarrassed to be seen in swimming trunks.