In our experience, the vast majority of people who take up the practices of SIF become closer to their families. They love people more, they love their family members more, they're more tolerant, they're more patient, they're more loving.
In Vaishnava Hinduism, children are raised to be independent critical thinkers, who are prepared to question everything. If someone accepts the teachings of Vaishnava Hinduism blindly, or accepts it based solely on tradition (i.e. “my parents are Vaishnava Hindus, therefore so am I”), they are not understanding or applying the process correctly.
Like other people, Vaishnava Hindus have children who sometimes end up not liking the spiritual path their parents chose. As is the case with children who are raised in Christian, Buddhist, Muslim, or atheistic families, sometimes the children feel angry or resentful at their parents for raising them the way they did. That has been the story of human history since time immemorial, with children blaming their parents for how they were raised. What would be surprising is if there were no children of Hindu parents who ended up wanting to go in another direction.
The teachings of Vaishnava Hinduism are deeply rooted in the appreciation of every individual’s free will. Each person must decide for themselves whether they want to follow the principles, lifestyle, and practices of Vaishnava Hinduism (karma and bhakti yoga). Love for God (the goal of Vaishnava Hinduism) is based on the freedom to choose whether or not to engage in a reciprocal loving relationship with the Supreme Lord. It cannot be forced. “Fanatics” are those who reject this freedom to choose, and try to force their beliefs onto others. Out of respect for each person’s free will, one who chooses to no longer apply these teachings in their life would never be coerced into continuing to following them.