[Given Cleo's age when she married our subject, it's likely she had one or more prior marriages, so ANDREWS is probably not her maiden name.]

1a.  Texas Divorce Index, 1968-2002 (online at Ancestry.com); also as the 1968 Divorce Index, Harris County, Texas (online at the Harris County TXGenWeb site):

Name:	Chris M H Christensen
Age:	57
Spouse's Name:	Frieda Benker [Christensen]
Spouse's Age:	46
Divorce Date:	30 Sep 1968
Marriage Date:	28 May 1949
Number of Children:	1
County:	Harris

1b.  Texas Marriage Collection, 1814-1909 (online at Ancestry.com):

Chris M H Christensen, age 57

Cleo K Andrews, age 56

27 Dec 1968

Harris Co.

2.  Texas Birth Index, 1903-1997. Texas Department of State Health Services (online at Ancestry.com):

Name:	Cynthia Margaret Christensen
Date of Birth:	4 Oct 1954
Gender:	Female
Birth County:	Harris
Father's Name:	Chris M H Christensen
Mother's Nmae:	Frieda Benker Hubl
Roll Number:	1954_0003

3.  1920 Census Every-Name-Index/Images (online at Ancestry.com):  can't find Chris, at least not with any certainty.  Frieda is not yet born.

4.  1930 Census Every-Name-Index/Images (online at Ancestry.com):  can't find Chris, at least not with any certainty.  Frieda is still in Europe.  Edward ELLIS (æ 4y3m, b. AR) is living in Hot Springs Twp., Garland Co., AR (p. 210A), with his parents.

5.  Texas Death Index, 1964-1998 (online at FamilySearch.org):

Name:	Christen Marius Henry Christensen
Gender:	Male
Death Date:	05 Feb 1997
Death County:	Harris
Death Place:	Harris, Texas, United States

6.  Anon.  27 Apr 2010.  "Death Notice: Frieda Ellis."  The Sentinel-Record, Hot Springs, AR (online at www.hotsr.com; abstracted by DGM):

Subject:  Frieda ELLIS, age 88, of Hot Springs, AR Death:  Sunday, 25 Apr 2010 Birth:  24 Feb 1922 in Neudonowitz, Czech Republic Life:  grew up in Vienna, immigrated to U.S. in 1945 Occupations:  quality control technician; dental lab technician, business owner Survived by:  husband, Edward ELLIS, Sr., and daughters Heide BOURNE and Cynthia CHRISTENSEN

How does Heide fit in?  Is she Heide (ELLIS) BOURNE?

7.  SSDI:  Social Security Death Index (online at RootsWeb.com):

Name	Birth	Death	Last Residence	SSN	Issued	Post-em
CHRISTENSEN, Chris M	03 May 1911	05 Feb 1997	76538 (Jonesboro, Coryell, TX)	049-10-4078	CT	No
ELLIS, Frieda	24 Feb 1922	25 Apr 2010	71913 (Hot Springs National Park, Garland, AR)	044-24-7228	CT	No
CHRISTENSEN, Cleo K	15 May 1912	03 May 2001	76538 (Jonesboro, Coryell, TX)	453-34-1760	TX	No
ELLIS, Edward	28 Dec 1926	Dec 1968	(not specified)	431-36-7520	AR	No

8.  Public Member Trees (online at Ancestry.com).

9.  Email from descendant.