I'm sorry, Vickie, but my ethics prohibit me from harming children or animals (although I've encountered a few adults in my life whom I wouldn't hesitate to put out of their misery...)
"Laken" apparently is an invented name with no particular meaning, unless one wants to ascribe the meaning of "lake" (an inland body of water) to it and say that the "n" was added on to give the name a more aesthetically pleasing, feminine sound.
The name seems to have made its first appearance in the name of a soap opera character -- "Laken Lockridge" -- who was in the television series *Santa Barbara* from 1984 through 1985. Soap operas are notorious breeding grounds for name popularity in the United States, so I would guess this is why we are finding a number of people born in the late 80s and early 90s bearing the name of "Laken".
Have you asked either your sister or brother-in-law where and when they first heard that name?
-- Nanaea