Is it a natural thing that you usually have a misunderstanding with your parents-in-law? Despite you have offered everything to them?

It is natural, especially because each and everyone has their own take on certain things--and having different point of views and opinions oftern lead to misunderstandings. But tell you what, it is okay and very normal. You just have to continue paying respect to your in-laws and they would most likely do the same.

Yes it is, it's actually the same thing as having an argument with your Father, mother or sibling. You will argue about the littlest things in life but it's completely normal, sometimes you just have to agree to disagree.

Yes very normal. There are still times that arguments will still arise. You cannot completely please everyone and that includes your inlaws.

Yes. I do not get along with my in-laws, the line is drawn very clearly.

Yes it is. Just let it be. Don't need to be the best of friends.