One may use money designated for Charity “Maaser Kesafim” to supply
his sons and daughters with necessities after they get married
(such as rent and furniture), particularly if they will be learning
in Kollel. One may also use such money to support his unmarried
children over the age of 6. It is best if one states up front that he
intends to use his Maaser money this way. (éçåä ãòú 3:76)