In Islam, you are not allowed to resort to such a way to get support from the welfare fund. Rather, you should work hard to increase your income so as to be able to support your family without resorting to such illegal means.

It should be stressed here that there is dignity in work, and each Muslim should work hard to earn his living in a dignified manner. The Prophet (peace and blessings be upon him) is reported to have said: “It is better that a person should take a rope and bring a bundle of wood on his back to sell so that Allah may preserve his honor, that’s better for him than begging from people, (regardless of) whether they give him or not.” (Reported by Al-Bukhari and Muslim)
Sheikh Ahmad Kutty, a senior lecturer and an Islamic scholar at the Islamic Institute of Toronto, Ontario, Canada, states the following: It is not permissible for any Muslim to act fraudulently. To do so is cheating and therefore against the teachings of Islam. Islam does not sanction two kinds of divorce, one for the law, and another for real; divorce is divorce.

So don’t even think of embarking on such actions. Allah has promised to provide for us if we remain conscious of Him and do our best by using the resources He has given us. Referring to this, Allah Almighty says, (Whoever remains conscious of Allah, Allah will make things easy for Him.) (At-Talaq 65: 4)
He Almighty also says, (Whoever remains conscious of Allah, Allah will provide for him in ways he can never foresee.) (At-Talaq 65: 5)
So, trust in Allah and seek halal (lawful) ways of providing for your family. Surely, there are substitutes for us in halal so that we are not forced to resort to that which is haram (unlawful).