I mae some assumptions in regard to the association of John H as being the sibling of Cecelia.
First..........
The mother of both has the first name Gertrude

Secondas another poster stated
Many dutch families name their first son after the grandfather of the fatherside and the second son after the mothers grandfather fatherside. The only son of John is Albert. The second son of Cecilia is also Albert.

Third
Both indicated they arrived in 1881 and both are buried in ST Joseph's cemetery

Fourth
A tenuous arrival, albeit names may be somewhat erroneous
The following arrivals are noted on 24 April 1881

Berend ahe 55
Harm age 19
Jan age 19
Janna age 15
Gesien age 11

Perhaps you can get more information from the details for those buried in ST Josephs

http://www.findagrave.com/cgi-bin/fg.cgi?page=gsr&GSiman...


Good lick.