mmm...interesting I had the heart murmur as a baby and that was the very first indication anything was different with me,,,we then forgot about it for 35 years.
I would get him checked jsut for peace of mind, I could never forgive myself if they had the condition and a simple test would have them under good medicale care so they dont end up here needing replacements..
I personally reckon in 15-20 yrs when/if their valves and aortas begin to wear-out there will be so much better medical options for them that its better they know now if they have the same dodgy-valve or not and to be treated or monitored for any changes,,,
i know for us it was a free service because thats how our medical system works for kids under 16...I would hope other systems are as generous when it comes to kids health.
now as for my understanding of the genetics of BAVD( dont know about your boys) it is inheritated autosominally-dominant OK...dominant...so therefore if you have a kid with it there is also a higher chance of having another child with the same naughty-gene
...thats kinda why I am going for 2 out of my 3 boys as well,,,and the male sex too , another more common sign...my dad only had 2 girls so i got a good dose of the BAV gene
.
wishing you all the best in the testing