I would consider your family lapsed Catholics.
Heresy and apostacy are very serious crimes. Like all crimes they involve knowledge, wilfullness and consent - anything mitigating these three criteria reduces and can possibly eliminate culpability.
Consent: E.g., someone doing something they know is wrong (knowledge) and doing it deliberately (wilfullness) but is doing so under some or any kind of pressure, threat or duress would mitigate their consent and reduce their culpability. Someone holding my family hostage could possibly demand I perform some crime that I know is wrong but I deliberately do anyways; notwithstanding, my culpability is limited (though not necessarily entirely removed) because I am not acting freely.
A heretic substitutes, replaces and/or perverts Catholic dogma. They do this by changing or denying some dogma or dogmas. However, it requires the criteria to be met. Often people act in ignorance and do not realize the full gravity or consequences of their beliefs, actions or behaviour. This reduces their culpability because it mitigates the above-given criteria. The Church is in part here to help us and prevent this from happening: i.e. she faithfully guards and teaches the faith in its integrity and maintains that integrity from corruption. Saint Thomas Aquinas is no heretic but he would be today if he insisted in his opinion against the teaching and authority of the Church against the Dogma of the Immaculate Conception. Of course, Saint Thomas submitted and entrusted all of his work to the care and judgement of the Church.
Again, heresy and apostacy are crimes (and so is schism). They involve grave subject matter.
In practice, most peope I think would consider your family as lapsed Catholics. Heretics are much more dangerous because they at least sound like Christians. No one is going to confuse or mistake your family’s rather colourful bouqet of beliefs with the Catholic faith or religion or as the “true” Christianity.
The Church is like an organism. Heresies are like infectious diseases that spread through the body. The Church, over time, becomes innoculated against certain heresies - the antibodies are already there to prevent the disease from taking serious hold again. Heresies tend to be novelties and as such aren’t immediately recognized - at least at first - as something deadly to faith. Catholics aren’t likely to confuse Lutheranism, for example, with Catholicism: they were liable to, however, when Martin Luther first appeared.
