Please help and answer my question if you can, I had applied for my 16 years old brother and 19 years old sister through new portal, I applied for 4 months stay visit visa but can I change my brother’s stay to 5 weeks as he is in 12th grade and he only gets leave for 5 weeks from school even he could get more days off but do you think it makes file stronger, can I send a webform to change dates for my brother’s stay as I don’t want the refusal, please if anyone can help Thank you.