family 可数,所以“一个丁克家庭”是a dink family 或 a dink couple 或干脆a dink
the world of two people will be more happy 不地道,宜改成 the life of a dink couple will be happier and more comfortable
Dink family is a kind of life...意思表达不够清楚,建议改成a person living an unconventional life is more open-minded and ready to accept new things.
a irresponsible performance...宜改成 an irresponsible act for society as well as for their parents.
having a child life 宜改成 having children in the family does not lead to less happiness
they will have no dependency 宜改成 they will have no one to depend on
就以上这些了,