I'll help as much as I can.Here's what I can tell you based on my resources which include paid online access to census records and free access to Ellis Island Records at www.ellisislandrecords.org
First, your husband's grandfather lived in Passaic, NJ.Passaic was a very common destination for immigrants from Herczegfalva, and right now, I'm sure he was from Herczegfalva.
Here is what I see in the 1930 census:
Passaic, Clifton Co., NJ
Stephen Tell51 Hungary Julia H.50 Hungary Anatele19 NJ(daughter) Stephen18 NJ(son) (can't read)12 NJ(daughter)
The ancestry.com census people translated the daughter's name as "Thealds," but this probably isn't right.It kind of looks like that, but that's not a name.
As for Ellis Island records...
Istval Tell of Herczegfalva, Hungary arrived at Ellis Island on September 27, 1904.The manifest indicates he was married at the time (but traveling alone) and was headed to Passaic, NJ to his cousin Johann Lautner (I think...it's hard to read).
On September 21, 1904 a Jozsef Tell age 19 of Heczegfalva arrived at Ellis Island along with Janos Schneider and were also headed to Passaic, NJ to his cousin Johann Lautner.
On November 24, 1907, a Johann Tell of Herczegflava age 17 arrived at Ellis Island along with several people from the village.He was headed to his brother Stephan Tell in Passaic, NJ.Johann's mother's name is on the manifest, but I can't read it.
A Ferencz (Frank) Tell from Herczefalva aslo arrived at Eliis Island on May 14, 1907.He was headed to Passaic, NJ also, but it appears he was going to a brother-in-law.The manifest is very hard to read.
In looking at the 1930 census, I think the Johann (John) Tell above remained in Passaic.I see a 41 year old John Tell born in Hungary in Passaic with his wife Gisella and two children.
Unfortunately, I can't locate Stephan Tell and family in Passaic in the 1910 or 1920 census although I'm sure they were there.If their last name weren't translated probably or if they were living with another family, I won't be able to locate them.
If you want to continue to piece together the family, I'd suggest you focus on records from Passaic, NJ and also all the church records from Herczegfalva which are readily available through a Family History Center run by the Church of Latter Day Saints.
P.S.I'm undoubtedly related to your husband, but I haven't yet pieced together my Tell family in Herczegfalva.It's on my list of things to do.