Conditional divorce

Q: My sister' husband conditionally says to my sister that if you do this, divorce will occur. This has happened 3 times. It is 2nd marriage of her husband and my sister lives alone and has to go out for groceries, etc. So she could not fulfill the conditions. Please tell if divorce has taken place or not?

Will a conditional divorce remain if couple get married after halaala?

Q: My husband gave me two divorces and after some years he gave me a third divorce. Between the second and third divorce he said to me that if you will go to my house (my house means his mother and relatives house) our divorce will happen. I never went to his house and his relatives house till the third divorce.

After iddat I married someone else and he gave me a divorce with his own will, not forcely. After iddat I married my first husband.

The condition in which he said in the previous nikah that if I went to my in laws house our divorce will happen, now is it permissible for me to go to my in laws house or not because now its a new nikah after halaala? 

Impurity of a dog

Q: Two days ago, there was dog sniffing the pathway for a long time. I saw a small handful puddle of wetness. So on that area I pushed the pram back and front again twice. After couple of days, my son used to play with the pram tyre by rolling it on his hand. He did that with wet hands and touched utensils with wet hands to eat and below where I have later placed utensils on top when wet. Now I know if a dog licked it we have to wash the earth 7 times. Now because of the saliva that has spread on my house must I wash each utensil that have been touched by him.