Do you want to leave your BTC to your kids?

Then use TIME_LOCK option and set a block in the future when you consider they deserve to get your BTC.

Then just give them the seed.

Putting into a trust your BTC means nothing.

Having the seed, you could anytime move the BTC from that wallet.

If you give away your seed, that means... you give a away your BTC to a custodial.

The best "trust" is to trust yourself with the keys.