1.  Marriage Record:

2.  1900 Census Every-Name-Index/Images (online at Ancestry.com, Image #17 of 18):  Millcreek Twp., Clarion Co., PA, Roll T623_1395, p. 209A, SN 9, SD 14, ED 16, enumerated 20 Jun 1900, official enumeration date 1 Jun 1900 (extracted by Diana Gale Matthiesen):

1900:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).
1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	19	20	22	23	24	25	26	27
???	???	Stroup Charley L	Head	W	M	Sep 1873	27	M	3			PA	PA	PA	Tool dresser	1	Y	Y	Y	O	M	H
		______ Lulu C	Wife	W	F	Feb 1876	24	M	3	1	1	PA	PA	PA	Keeping House		Y	Y	Y
		______ Arthur L	Son	W	M	Oct 1898	1	S				PA	PA	PA

Lulu's widowed mother, Maggie MORROW, is also in Millcreek Township, listed next to Philip F. STROUP, first cousin of our Charley's father, James Sterrett STROUP.

3a.  1910 Census Every-Name-Index/Images (online at Ancestry.com, Image #27 of 51):  Peru Town, Belleville Twp., Chautauqua Co., KS, Roll T624_433 (Part 3), p. 112B, SN 14B, SD 3, ED 1, enumerated 4 May 1910, official enumeration date 15 Apr 1910 (extracted by Diana Gale Matthiesen):

1910:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).
1	2	3	4	5	6	7	8	9	10	11	12	13	14	17	18	19	20	23	24	26	28
24	24	Stroup Charles L	Head	M	W	39	M1	6			PA	PA	PA	Eng	Driller	Oil Field	W	Y	Y	R	W
		______ May	Wife	F	W	34	M1	6	1	1	KS	IN	IN	Eng	None			Y	Y
		______ Charles D	Son	M	W	2	S				KS	PA	KS		None

This is Charles's second marriage.  Listed two households from Charles's married sister, Jenna (STROUP) HILLIARD.

3b.  1910 Census Every-Name-Index/Images (online at Ancestry.com, Image #15 of 15):  Mill Creek Twp., Clarion Co., PA, Roll T624_1329, p. 284A, SN 8A, SD 18, ED 16, enumerated 25 Apr 1910, official enumeration date 15 Apr 1910 (extracted by Diana Gale Matthiesen):

1910:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).
1	2	3	4	5	6	7	8	9	10	11	12	13	14	17	18	19	20	23	24	25	26	27	28	29
125	127	Morrow Margrete A	Head	F	W	56	M	22	4	3	PA	PA	PA	Eng	Farmer	General farm	Emp	Y	Y		O	F	F	104
		Stroup Arthur L	GSon	M	W	11	S				PA	PA	PA	Eng	None			Y	Y	Y

Margaret Ann (HILLIARD) MORROW is apparently Lulu's mother.  Listed three households from Arthur's paternal grandparents, James & Mary (GRADY) STROUP.

4a.  1920 Census Every-Name-Index/Images (online at Ancestry.com, Image #

4b.  1920 Census Every-Name-Index/Images (online at Ancestry.com, Image #3 of 10):  Fisher, Millcreek Twp., Clarion Co., PA, Roll T625_1551, p. 250A, SN 2A, SD 18, ED 73, enumerated 9/10 Jan 1920, official enumeration date 1 Jan 1920 (extracted by Diana Gale Matthiesen):

1920:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).
2	3	4	5	6	7	8	9	10	11	12	17	18	19	21	23	25	26	27	28	29
Fm	30	30	Morrow Marguerite	Head	O	F	F	W	63	W	Y	Y	PA	PA	PA	Y	None	General farm	Oa	29
			______ Arther	GSon			M	W	21	S	Y	Y	PA	PA	PA	Y	Farmer	General Farm	Em

5a.  1930 Census Every-Name-Index/Images (online at Ancestry.com, Image #

5b.  1930 Census Every-Name-Index/Images (online at Ancestry.com): Arthur L. STROUP is still living in Clarion Co., PA, but his grandmother has died and he has married.

7.  Fisher Methodist Cemetery, Mill Creek Township (online at the Clarion County PAGenWeb site; transcribed by Nate Zipfel):

Last Name	First Name	Middle Name	Date of Birth	Date of Death	Age at Death	Notes
Stroup	Lulu		1896	1902

Lulu was born in 1876, so it appears the stone was mis-read.