How important is family life from God’s viewpoint?

It's so important that He considered marriage to be blessed. He even gave rules for family members. Children are to abide by their parents' rules, BUT (and ironically, this is what most people often ignore and favor the parents' ruling), the parents must NOT give reason for their children to be angry with them. In other words, you CAN'T raise them however you want. Family has to be a loving environment, lest man corrupt it by making it a toxic one, turning it into a curse instead of a blessing. 

Family was God's origin, his kingdom so to speak~ Father, mother and children 

VERY IMPORTANT....WE ALWAYS LOVE OUR CHILDREN.and siblings etc.

Feel a lot of people leave and then make mends etc but person has to not overthink that etc . 

It one of the most important, if not THE most important, aspect of human life we can think of. In fact, our relationship to God is almost identical to the family relations. 

On top of that, families are the building blocks of society. 

Without family, then what's left?

If the family is healthy, very they are your support system,

If it is toxic, you lose any benefit and you might as well stay away.

God does not want you to suffer needlessly, however if there is a chance of fixing the situation he may ask you to endure for a while

Whatever you do, do not burn any bridges, as things can change

According to your jw cult leaders, not important at all.

You kill your own kids by refusing them life saving blood transfusions.

You shun your kids to suicide.

Your cult refuses to report your pedos to the authorities.