Love my in laws too.
My DH is currently at his dads bedside in a hospital in France because he is very poorly.
Love them like my own mum and dad, I just wish I could be there too. 
Awww, what a melancholy post!
Sorry your parents have passed, but thrilled that your in-laws are great. 
@Ironfloor269
I think it's due to people not managing and tolerating others. I grew up in an Asian culture where living with in laws is very common. Yes, there are disagreements, yes, you don't always get on..but both parties just agree to disagree and get on with things. They tolerate each other. And eventually, the in laws just becomes a part of your life.
I'm not saying the Asian way is right. It's not. I'm an extreme introvert and there's nothing i hate more than sharing my home with guests. But if it's only for a few days, I can and will tolerate my in laws. They won't live forever, they are my partner's parents. Just tolerate them for a short time.
That is a good post with some good valid points.
However, if only it were that simple for everyone...... Thing is, it's not always as simple a matter as 'I will be fine with my DH's parents staying a few days, as they are his parents,' and 'live and let live' and 'you need to tolerate each other,' and so on........'
Often, when someone has a mother-in-law issue, (women especially,) it's not about her DH's parents staying a few weekends a year; it's often about constant digs, (and put-downs, and criticism,) being treated differently to the other DILs, your kids being treated differently to their other grandkids, sniping, histrionics when your husband defends you over his mother, demanding, entitled behaviour (thinking her wants trump everyone else's,) and thinking she is always right.
Seems to be daughter-in-laws who get this shit, not so much son-in-laws. Seems to be the mothers of boys who are more difficult and think NO woman is good enough for their son. Don't get so many mothers thinking no man is good enough for their daughter.