Is there an easy and free way to update personal web search information like address, marriage, relatives, etc.

Not sure what you mean. Almost all personal info on the web is garnered from public databases or from info you enter at a web site. To edit any of this info you need to go to the source.

No it is not easy to update "web search" info, since it is based off or most popular web sites, and those that have "key words" based into them, your address will be in dozens of sites with published phone numbers, you will be listed in any site where your name is mentioned by you or by others.

A few government sites allow update of imfo but most still do not.

So normally you would have to contact each web host one at a time and ask for information to be corrected.