"Aihua, your father and I are unsophisticated country folks. Who do you think we're doing this for? If we didn't know your second brother and sister-in-law's temperaments and had not figured out the old couple from the Zhang family, would we be doing this?
If we don't make your second brother and sister-in-law feel indebted to us, sure, they might help Chuchun and Chuqiu. But how they'll help and whether it will meet our expectations are another matter.
If it's just about joining the army and getting discharged after a couple of years, we wouldn't need their help. With the qualifications that Chuchun and Chuqiu have, they're sure to be accepted as soldiers. What we want is for the two kids to never have to worry about food and clothing and not to have to work hard for their whole lives, right?