What, if anything, can we do

Location: Idaho, several years ago. Current location either still Idaho or Washington.

When my husband was young he stumbled into a dark family secret after he witnessed an unforgivable incident involving an uncle and a minor cousin. This cousin was not his only victim. Since then there have been very few family members asking for justice while the rest of the Large family wants to leave it in the shadows.

Our (husband and myself) largest concerns are that the rest of the family is still protecting him and he is currently working in a high school and coaches a girls basketball team.

So I’m asking. What can we do? Is there anything we can do?