Braingle: 'Mary's Dad and Grandfather' Brain Teaser

Mary's Dad and Grandfather

Logic puzzles require you to think. You will have to be logical in your reasoning.

Puzzle ID:	#308
Fun:	(2.6)
Difficulty:	(1.56)
Category:	Logic
Submitted By:	Phyllis
Corrected By:	rose_rox

For Show and Tell at school, Mary told her class that today was the birthday of both her father and her grandfather and that they were exactly the same age. Her teacher said that was impossible, but Mary insisted she was right. Can you explain how she could be right?

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Answer

Mary was talking about her father and her maternal grandfather.

Her father, for example, could be 50 and her mother`s father, her maternal grandfather, could be 50. Her mother is obviously younger than her father.
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Comments

(user deleted) Nov 22, 2001	Or her grandfather could have been born on the 29th of feb
dark-prince Apr 18, 2002	or her mother could have died and her father then married the girls grandmother making him her granfather and father at the same time
HI_everybody Feb 11, 2003	YO dark knight that dudnt make no sense 2 me, xplain it better 4 me plz!
HI_everybody Feb 11, 2003	i mean dark prince lol
lessthanjake789 May 28, 2005	well, dark-prince - thats a disturbing oedipus complex type deal, and petera, if they were BOTH born on feb 29th, years apart, then the grandfather would still be older. not AS much (4 instead of 16 years, 6 instead of 24, etc) but they still wouldnt be the same age
smarty_blondy Oct 23, 2005	Deep breath... I thought that the girl's father abandoned her and, her grandfather adopted her. Therefore i assumed she called her grandfather her father and, considered them one and the same. Good one.
boodler Nov 25, 2005	Should have read hint! I went with leap year thing, also
boodler Nov 25, 2005	Should have read hint! I went with leap year thing, also
stephiesd Dec 18, 2005	how far apart are her parents in age? like 20 years? that's too much of a gap.
thompson1 Mar 10, 2006	boodler, u did that 2 x n e way i got that rite away
ffoppia Apr 03, 2006	NO Kidding!! Donald trump is older than his wife melania's father. so their newborn son barron william trump is gonna face the same situation
stang99 May 16, 2006	what's obvious about a woman being younger than the man!
spazzyjazzy93 May 21, 2006	ew thats so weird marrying someone the same age as your dad good teaser
Unraveled Aug 01, 2006	At first, I thought that it was a trick question - both her father and grandfather were 0 days old on their birthday! Then, I realized that it was a logic question, and got stumped.
rrn0rrnrrnY Sep 08, 2006	I got it! I think I heard of one somewhat similar some time ago and that probably helped. Good teaser!
dimez_00 Oct 27, 2006	omg i thought the answer was gonna say that her grandfather got her sister pregnant and they had her making her the grandchild and child lol.
ciotog Nov 05, 2006	First, excellent teaser! Second, leap years come every 4 years, so someone born on Feb 29 still ages 4 years in between each Feb 29th.
Trickster1992 May 02, 2007	dude if a man marries a woman who's father is as old as the man is.... that would make the man old enough to be the woman's father.. that's just not right. >< Good thinker though. =)
ava199345 Jul 29, 2007	Mom must be quite a bit younger than Dad.
chickwithbrains Sep 27, 2007	well I hate to say it people, but it happens -- and it goes both ways --> younger men with much much MUCH older women as well. 20-30 year age difference is WAY too much for my tastes, but everyone is different I suppose... Anyway -- great teaser!!!
RomanG417 Jul 28, 2009	to stang99: A woman whose father is as old as her husband is "obviously older than she is"
RomanG417 Jul 28, 2009	sorry, meant "younger than he is"
wwestar1000 Aug 10, 2010	I actually got that right!