Payneless Grammar

I have been lazy and haven't kept up my blog...but it seems that folks on Facebook and other blogs have difficulty with how to say something belongs to them and someone else.  I saw it again this morning and thought maybe I needed to blog about it just so I can rant. A little. well, Maybe a  bunch of ranting.  SO here goes.  I read a very touching blog the other day, but there was this thing....I's.....there is not such word.  John Doe's and I's life. UGH..NONONO....MY is the possessive for I.  you would never say, "I's life changed," would you?  SO don't write it when you connect it to someone else's life.  John Doe's and my lives changed.  OK?  Why is that hard?   Gene and my lives are so much better when I don't read bad grammar!  So help my husband out so he doesn't have to hear me rant, would you?  Thank you in advance.  Now, go about your day and do something AMAZING.  Love each other and be kind.