We have debated this quite a bit. After this post, I am going to stop. This is not an attempt to say that you are not worth talking to. You make interesting points.
With respect to "the people" not having requested a second vote, there is no method for them to do so. Nonetheless, they have created a few. 5 million signatures were received by a petition on the subject. There are arguments about the possibity of multiple signatures. That applies to all online petitions. No leave petition has managed anything similar. Several hundred thousand people marched for a second vote. This is many times the number who have joined any leave March. More people just voted for parties demanding a second vote than those advocating Brexit.
With respect to your second point, on what basis do you say that voters did not intend to see what the best deal we could get was and then decide ? The question they were allowed to vote on was simplistic. The voters were given only the crudest options. That doesn't mean that their intentions were similarly crude. Seeing what the best offer is and then deciding is an elementary negotiating strategy. I think you do the voters a disservice if you assume it was beyond them.
The fact that your father in law regards the will of the people in the past as more sacred than the will of the people now is, meaning no disrespect, a quirk of his personality which should not be allowed to affect my future, or my children's.
Oh, and while the economic argument is one strong factor for remain voters, it is not the essence of the debate. It is for me and many others about embracing the world or rejecting it.