Custody of children

Q: When a man has divorced his wife and they have children so the small children are by the wife. However, he is allowed to visit them. But the problem is that the husband wants the children to spend the weekends by him i.e. that is he wants them to spend the nights as well by him on Friday and Saturday. But the wife says that they may only spend the days a the husbands home, not the nights. Is it correct for the wife to say so? 

Importing goods on machinery license due to lower import duty

Q: Our government has imposed 30% duty on import of machinery on trade license but if we import on manufacturer license then the duty is 10%. But the manufacturer is not allowed to resell the machine. I was importing machines on someones manufacturers license and sell to my customers and save the tax. Now I am very much confused that either it is halaal or haram? Similarly my machine price is USD 14000 c&f but the government has fixed the amount USD 9700. So we under invoice to USD 9700. Please also let me know that either it is allowed or not?

Participating in a competion

Q: Is it permissible to take part in a competition where you have to buy an item and they ask you to sms a secret code inside the wrapper? Will this be regarded as gambling as you are paying towards the competition due to the fact that you first have to buy the item although it is selling at the normal price?