See also

Henry BERESFORD's parents: John Henry de la Poer BERESFORD (1844-1895) and Blanche Elizabeth Adelaide SOMERSET (c. 1854-1897)
Henry BERESFORD's siblings: Mary BERESFORD (1877-1877), Susan de la Poer BERESFORD (1877-1947) and Clodagh de la Poer BERESFORD (1879-1957)
Beatrix PETTY-FITZMAURICE's parents: Henry Charles Keith PETTY-FITZMAURICE (1845-1927) and Maud Evelyn HAMILTON (1850-1932)
Beatrix PETTY-FITZMAURICE's siblings: Evelyn Emily Mary PETTY-FITZMAURICE (1870-1960), Henry Wiliam Edmund PETTY-FITZMAURICE (1872-1936) and Charles George Francis Mercer Nairne PETTY-FITZMAURICE (1874-1914)

Family of Henry de la Poer BERESFORD and Beatrix Frances PETTY-FITZMAURICE

Husband:
Henry de la Poer BERESFORD (1875-1911)
Wife:
Beatrix Frances PETTY-FITZMAURICE (1877-1953)
Children:
Blanche Maud de la Poer BERESFORD (c. 1898-1940)
Katherine Nora de la Poer BERESFORD (c. 1899-c. 1991)
John Charles de la Poer BERESFORD (1901-1934)
Beatrix Patricia de la Poer BERESFORD (c. 1902- )
William Mostyn de la Poer BERESFORD (1905-1973)
Hugh Tristam de la Poer BERESFORD (1908-1941)
Marriage:
16 Oct 1897
London, St George Hanover Square^1,2

Husband: Henry de la Poer BERESFORD

Name:
Henry de la Poer BERESFORD
Sex:
Male
Father:
John Henry de la Poer BERESFORD (1844-1895)
Mother:
Blanche Elizabeth Adelaide SOMERSET (c. 1854-1897)
Birth:
28 Apr 1875¹
Title:
6th Marquess of Waterford
Death:
1 Dec 1911 (age 36)¹

Wife: Beatrix Frances PETTY-FITZMAURICE

Name:
Beatrix Frances PETTY-FITZMAURICE
Sex:
Female
Father:
Henry Charles Keith PETTY-FITZMAURICE (1845-1927)
Mother:
Maud Evelyn HAMILTON (1850-1932)
Birth:
25 Mar 1877¹
Death:
5 Aug 1953 (age 76)¹

Child 1: Blanche Maud de la Poer BERESFORD

Name:
Blanche Maud de la Poer BERESFORD
Sex:
Female
Spouse:
Richard Desiré GIROUARD (1905-1989)
Birth:
c. 1898¹
Residence:
1940 (age 41-42)
Marylebone, London W³
Address: 10 Upper Berkeley Street
Death:
29 Sep 1940 (age 41-42)
Staines, Middx^1,3
Cause: Injuries sustained in a car accident

Address: Staines Hospital
Probate:
21 Apr 1941
Llandudno, Gwynedd³
Value of Estate £5,675 13s 5d

Child 2: Katherine Nora de la Poer BERESFORD

Name:
Katherine Nora de la Poer BERESFORD
Sex:
Female
Spouse:
David (Sir) DAWNAY (1903-1971)
Birth:
c. 1899¹
Death:
c. 1991 (age 91-92)¹

Child 3: John Charles de la Poer BERESFORD

Name:
John Charles de la Poer BERESFORD
Sex:
Male
Spouse:
Juliet Mary LINDSAY (1904-c. 1987)
Birth:
6 Jan 1901¹
Title:
7th Marquess of Waterford
Death:
25 Sep 1934 (age 33)
Curraghmore, Portlaw, Co. Waterford, Ireland¹
Cause: Injuries sustained in a shooting accident in the gun room

Address: Curraghmore House

Child 4: Beatrix Patricia de la Poer BERESFORD

Name:
Beatrix Patricia de la Poer BERESFORD
Sex:
Female
Spouse:
Lynden Roberts MILLER ( -c. 1973)
Birth:
c. 1902¹

Child 5: William Mostyn de la Poer BERESFORD

Name:
William Mostyn de la Poer BERESFORD
Sex:
Male
Spouse:
Rachel PAGE ( - )
Birth:
30 May 1905¹
Death:
24 Nov 1973 (age 68)¹

Child 6: Hugh Tristam de la Poer BERESFORD

Name:
Hugh Tristam de la Poer BERESFORD
Sex:
Male
Birth:
1 Oct 1908¹
Death:
23 May 1941 (age 32)
At Sea¹
Address: On board HMS Kelly

Sources

1.: thepeerage.com.

2.: England & Wales Marriages 1837 - 2005. Vol 1a P 889.

3.: England & Wales Probate Death Index 1858 - 2019.