1850 census Warrensburg, Johnson Co. MO
HEAD: B.W. GROVER age:38 Ohio farmer (Benjamin)
Letitia age:33 OH Keep house
Sarah age:12 INDIANA (Barret)
George s. age:7 Ind.
Anna age: 6 MO. (Harris)
Elizabeth age:1 MO

So this census tells me that his 2 older brothers John S. and Courtland G that both died in 1846. John March 7 and Courtland April 27. Courtland was only 8 months/5days old and I believe John's headstone also gives his age at death as under 1 years.

search finds older sister Sarah born Ind. 1838
A marriage record Missouri, Marriages 1750-1920
NAME: John Barret
SPOUSE: Sallie GROVER
DATE: 26 APRIL 1860
PLACE: Johnson Co. MO
There is no memorial for her nor is she noted to be buried in the family location. However their son Benj. Grover Barret is buried here #82480092

Sister Anna Grover-Harris is buried here #82479780
with the rest of their family, as well as his other sister Elizabeth F. Grover (spinster)

1860 census Warrensburg, Johnson Co. Missouri
HEAD: B. W. GROVER age:48 farmer OH
Letitia age:34 KY
GEORGE S age: 17 Ind.
Annie age:14 MO.
Elizabeth F age:11 MO
Benjamin W. Jr. age:9 MO
Martha C. age:6 MO (Culton)
Robert J. age:2
'**********************************************************
Civil War Service:
1) 27th MO. Mounted Inf. Co. C Pvt.
...He was "discharged by Brig. Gen. Curtis on Nov. 5 1861"
( THIS HAPPENS TO BE 5 DAYS AFTER HIS FATHER DIED and he was only 18 years old)

2) Co. H 23 Enrolled MO. Militia- Pvt.(as per pension card)

3) Co. B Foster's Cav. Batt'n MO. Vols. Capt.
and then the pension card that gives all the above info and the date/place of death as: Oct. 1 1927 St. Louis MO.

The other thing is, George was also in the Reg. with his future father-in-law..
Chaplain Robert A Foster who is linked to wife Maggie.

Missouri, Marriages, 1750-1920
NAME: George S. GROVER
SPOUSE: Maggie C. Foster
DATE: 1 March 1866
PLACE: Johnson Co. Missouri

Bessie F. GROVER
dau. of George S & Maggie C
GROVER
BORN: Dec. 29, 1868
DIED: Mar. 1, 1869
This appears to be their one & only child and she only stayed with them for 2 months.

1870 census Warrensburg, Johnson Co. MO
HEAD: Grover, George age:27 IND.
County Treasurer
Wife: Grover, Maggie age:22 Keep house MO
Bayles, Margaret age:21 Domestic born:Ohio

1880 census St.Louis MO.
HEAD: George S. age:37 lawyer born Ind
wife: Maggie age:32 MO
Others: Sayers, Kate/ Ketchum, Jennie both age:27 Oh

1890 US Census for Civil War Soldiers, Widows.....
St. Louis, MO
image #943
lines 43-45 George S. Grover names the above 3 military served: Co. C 27th MO.- dates, July 4 1861-Nov. 5 1861
Co. H 23 June 11, 1862-Sept. 24 1864
Co. B Sept. 24, 1864-Nov. 4, 1864
and below gives address/reason for payment:
520 Olive st. St.Louis, MO ---"#1-Left arm/wrist broken by fall from horse during scurmish with Guerillas near Warrensburg, MO July 10, 1861. #2-visability on account of sickness June 1863." same address given for 1863.

1900 census Central Twnshp St.Louis, MO
HEAD: George S. birth: Sept. 1843 Ind
Wife: Mary ??? s/b Maggie age:53 keep house MO

1910 census Wellston, St. Louis, mO
HEAD: George S. age:67 Ind 1843
Wife: Margaret age:63 MO

and then his wife Maggie passed 27th May 1917.

1920 census Wellston, St. Louis, MO
HEAD: George S. GROVER age:77 Widowed 1843 Ind
no one else is listed

And then 1st Oct. 1927 George joined his beloved wife, Maggie and Daddy's baby girl.