Hi
@Udee ,
Hi ksphr,
For the purpose of travel, I wrote a detailed letter.
If you are the main applicant who apply for work, then you must have already got a job right? Then you have to explain the offer you got, and that need to have your wife and daughters with you during the stay.
If your wife is the main applicant who got the study offer in a collage, then your wife has to write this letter explaining her study purpose and the necessity of you and the daughters with her. If you have previous work experience too, mention that in the letter saying that you will be able to get a job after getting the open work permit.
Good luck !