I am about to sponsor my parents with two dependent step brothers. I am worried because i think DNA might be required to find out if my step brothers are really my fathers children because my last brother from my parent is 8 years older than my first step brother. What worry me the most is that i remember about 12 years ago when my last step brother was about 4 years old my mother told me that, she is not sure he is my father's son because his head is too big and my step mother was a cheater that support her claim when my step mother got caught with another man and my father left her, since then my two step brothers have been living with my parent ( my mother and father) My concern is that if incase a DNA is requested by the embassy which i think is likely because of the age difference between my last brother and my step brothers and if incase it is proven that my last step brother is not my father's son whereas all along my father has been taking care of him and believe is his son, what is the embassy going to do? are they going to refuse his application for PR? What should i do if i am not sure if he is my father's son? he is only 15 years old, should i not include him as accompanying family member? then when my father becomes a permanent resident, he can then try to sponsor him, but this option may be difficult since i don't beleive my father will be making any income to sponsor him. Please help. I am very confused, i want to help this little boy, but also don't want my parents application to be rejected because of him.