So much has changed in the world over the last 40 years. This family needs education, healthcare and maybe even therapists to help them accept the modern world. I can't imagine being in their shoes, it must be completely overwhelming. They should also be given the choice to lead their lives just as they want to, provided they are safe and not harming anyone else.
Yes, this family should be given free education to bring them back into the modern era if they want it. We should be able to get them involved in modern day society simply by helping them along. They will need all the help they can get at this point in their lives.
They have to catch up somehow. The thought of being cut off from all civilization for that long is absolutely astounding, and I cannot imagine all the new things they must now learn to do and catch up on. Imagine the people that have been born and died, the change in government, technology, and society. Someone needs to ensure they are brought back up to speed to allow them to live a normal life.
Unless the family found after 40 years of isolation want to reengage with the larger society they should be left alone. If they want to try to assimilate, then they should be welcomed. However, it should be left to them and the rest of the world should leave them to their own devices.