DO NOT:
announce that you want to wash your clothes, dump our dirty clothes out of the washing machine, wash your own clothes and leave our dirty laundry in the middle of the kitchen floor.
Go and buy a punnet of strawberries and a punnet of blue berries for your self, nothing for my two children (1 and 3), sit in the car and stuff your face with them while I get the children in the car and then offer me one strawberry. When I indicate that my children love Blue berries, don't eat all but twelve (infront of them) and then SHARE the last 12 with my 3 year old (3 to him, 9 to you)
after having stayed for 3 days, unannounced and not having contributed anything at all - when asked if you are staying for a meal which your hostess has to buy food in for specially - which is in one hours time - say "I don't know, does it matter?" when you have just been told that your hosts needs to know whether to get enough food for you or not.
Do NOT make your hostesses 3 year old cry repeatedly by repeating the same behavior - especially when you are asked to stop. When this request to stop is repeated more forcefully, do not respond by saying you are "toughening him up"
Do not, when it is made very clear that you are not welcome again - respond by texting your hostess that she is self pitying and blames everyone else for everything.