I don't think I would've believed it years ago, but now it's only my dad (72) and I. My mom died several years ago and I lost my sister recently.
Here it's dh and I (will be 24 yrs this year!) and my little guy (5-1/2). I would've loved to have more, but we weren't planning on having children until my sweetie showed up - and now I'm too old! (48)