Family Lines

<div>Stick with me a minute. My wife's family is planning a family reunion cruise for 2017. It is a little tricky since she is part of a yours, mine and ours family. She and her twin brother are the youngest of twelve but Mom had five kids and Dad had five kids when they got married. My wife wasn't born until after her father retired from the Army. Some of her nieces are older then she is.</div><div><br /></div><div>What does this have to do with SF? Well currently we have a life span of about 72 years and only about thirty of those years are really good for reproduction. But our SF Humans live 200 years. So if we expand their reproductive years accordingly we can see some pretty large and extended families. Your character can have a Great Aunt who is 50 years younger then they are. </div><div><br /></div><div>With your family tree now looking more like a plate of pasta how would this effect relationships, inheritances and other aspects of family life?</div><div><br /></div><div>Could a new colony be much like the State of Rhode Island where all long time residents can trace themselves to one or more of six family lines.</div><div><br /></div><div>Also wondering about schooling. 150 years ago most people did not go to school much past 6th grade since they usually learned all that was thought they needed to get along by then and women were considered old maids if they did not marry by 25. Those things have changed partly because people are living longer. BUT how would this affect SF characters? Do they graduate secondary school at age 30 and college at 40? Is the voting age 32? When can you get your gyrocopter license?</div><div><br /></div><div>Sure I missed some things just fill in.</div>