Parents need to love the Faith, love God, love the Blessed Mother of Our Lord Jesus Christ, and have the saints as their friends and real-life role models.
If the parents are warriors and love the Faith, spending lots of time & effort on it themselves, the children will perceive that the Faith is something truly wonderful, good, and valuable.
There must be love and spiritual happiness/peace in the household, with serving God as the foundation. There should be "peaceful consciences all around" which is the ONLY foundation of any kind of happiness or peace.
And yes, it's important for the family to do things TOGETHER, to form close bonds. Including things related to the Faith.
The Faith is not about pure negativity. If it's all sour faces, privations, isolation, beatings, hypocrisy of the parents, self-indulgence of the parents, etc. then yes, the kids won't be on board.
And last but not least, children form their idea about God's fatherhood from their father. Is he absent? Well then God is far off and absent, and doesn't love them. Yes, you MIGHT be able to override some of this with enough prayer/study/training -- but human nature is the current of the stream. You will be forever swimming upstream, which is far more difficult. You don't want psychology/human nature to be your enemy, EVER, if you can help it. Psychologically, children get their idea of God from how their earthly father behaves. It's how they learn about fatherhood, authority, Providence, father's love -- and God.
It's how God created and designed the world. He gives us visible stand-ins (representatives, vicars) for Himself in different contexts: the Pope, our earthly fathers, etc. We call it "having authority". It's why fundamentally, with rare exceptions, Catholics are not rebels. Only under certain very specific circuмstances should Catholics "rebel".
God created the "Patriarchy". Interesting how that's become the worst thing ever, in current year, according to feminism. Also, Americans are allergic to any kind of authoritarianism -- any kind of top-down authority that doesn't originate with the ones governed (which is ludicrous, if you think about it. If I give permission for you to rule me, then I'm really ruling myself)