some childless couples or even single couples along with couples with children can be committed to something that takes a lot of their time and discipline such as leaderships role for an organization, careers, setting up a non-profit organization or even missionaries which requires a broad range of responsibilities that one would have to make sacrifice from their daily life style. I am sure there is a lot more out there.
I would not say that couples with children have more responsibility compared with couples with no children or singles with or without children on general term as that would be jumping the gun.
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