Aloysius is the Latinized form of Alois, which is the German form of the French name, Louis.  In English, Aloysius tends to be pronounced allo-I-shus.

— born in Buffalo, Erie Co., NY:
5.  (Johann) Georg / George STRAUB, b. 14 Feb 1844

The children give immigration dates from 1835 to 1844, but a date ca. 1843 seems evident from their birthplaces.

1.  1850 Census Every-Name-Index/Images (online at Ancestry.com):  can't find, and I really looked.

2.  1860 Census Index/Images (online at Ancestry.com, Image #54 of 235):  St. Joseph P.O., City of St. Joseph (First Ward), Buchanan Co., MO, Roll M653_609, p. 390, PN 118, 864/802, enumerated 25 Jul 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):(¤•)

E Straub	27	M		Grocer	5000		Ohio
C Straub	23	F					Germany
Geo  "	2	M					Mo
A Straub	19	F					N Y
Edward "	21	M		Black Smith			France
J      "	25	M		Laborer			"

"E" has to be Alexander, who in later censuses gives his birthplace as France; "C" is Alexander's wife, Catharine; "Geo" is their son, Edward George.  "J" is Joseph, and "A" is Adelia.  But where is Johann Georg?  In later censuses, both Alexander and Adelia give their birthplace as France. 

3.  Death Certificate: George Straub.  California State Board of Health, Bureau of Vital Statistics, County of Los Angeles, Local Registered No. 1198 (scanned image kindly provided by Renee Straub):  The handwriting on the certificate is "idiocyncratic" leading to various readings of the Mother's given name.  The difficulty stems from the lowercase "h," but if you look at the lower-case "h" in the decedant's Race, "White," it becomes clear that the Mother's given name is Catharine. 

3.  Messages posted to the STRAUB Surname Board (online at RootsWeb.com/Ancestry.com).

4.  Messages posted to the Straub Family Genealogy Forum (online at GenForum.com).