In the index I found a listing for William Morren, not as a probate file, but listed as an "Incompetency" case. Reading the file I found that the children of William Morren are petitioning the court for a guardian to be appointed to have the care and custody of his person and his personal estate (valued at $400) and real estate (valued at $1500). It is 1895 and William is at this time 72 years old.
"The said William Morren is old and at times is very forgetful, his mind becoming very weak and at times when his mind becomes weak (which is very often) he is utterly unable and mentally incompetent to have the care and management of his property and during such periods and in fact almost all of the time he is liable to be imposed upon to such and extent as to lose his property (by and through designing persons) ...
It then goes on to say he has expressed the desire to his children that a guardian be appointed to protect him. and look after his property.
It then goes on to list his next of kin:
Peterje Van der Schraaf, daughter, lives at Holland
Aaltje Douma, daughter, lives at North Holland
Willemtje Hop, daughter, lives at Beaverdam
John Morren, son, Post office North Holland, Mich.
William Morren signs a statement that he desires and consents that Halbe Douma (husband of his daughter Aaltje) becomes his guardian and cares for his property and person. Interestingly - the statements are notarized by Wietse Douma, brother of Halbe (not my grandpa).
And so, the court does appoint Halbe Douma as guardian. Halbe, however, dies in 1898. In the 1900 census, William is living with his daughter Petertje van der Schraaf. I did not find another hearing for appointment of a new guardian. Possibly his daughter Aaltje carried on the responsibility, or her sister and her husband took over. He died in 1908 at age 84.