There are quite a few probate records (also spellings) for you to sort out.

Abstracts of Inventories of the Prerogative Court of MD:

Widow Francis CISSELL, 17.335, SM Co., 16 Mar. 1732, 10 Aug. 1733. Next of kin Elender THOMAS. Admr. Thomas VANRISHWICK.

John SISSEL, 28.15, SM Co., 31 May, 6 July 1743. Appraisers Richard WIMSETT, John RALEY. Next of kin Thomas & John Baptist RESHWICK. Admx. Sarah SISSEL.

Wm. BRADBURN, 32.78, SM Co., 6 Nov. 1745, 4 Mar. 1745[6]. Appraisers A. THOMPSON, Thomas VANRISHWICK. Next of kin John BRADBURN, Henrita WIMSETT. Admr. Wm. YATES.

MD Calendar of Wills:

William BRADBURN, SM Co., 31 Oct. 1745, 7 Nov. 1745. To wf. Anne, & ch. John, Henrietta, Priscilla, Appolonia, & Monica REDMAN. Son-in-law Francis SPINKE. Coexs. Wm. & Mary YATES. Wit. John Baptis RISHWICK & Wm. RUSSELL.

Thomas VANRISHWICK, Sr., St. Mary's Co., 2 July 1751, 11 Mar. 1751 [2]. To son John, pl. where he li., 12 a. of "White Acor." To wf. Anne for life, home plantation, then to son Thomas. Mill to sd. sons after death of wf. Anne. Residue to wf. Anne, exx. Wit. Elextius KNOTT, Jas. SISSELL, Chas. NEALE.

Ann VENNSWEEK, SM, 3 Jan. 1759, 6 Mar. 1759. To ch. Elizth. NORRIS, Mary SERKLIFF, Monica SPINK, & John, Thos., & 3 youngest daus., coexxs.: Ann, Elenr. & Winifred VANNSWEEK. Wit. Anthony ROBERTS, Ignatious SISSELL.

[Was Ann VENNSWEEK Mary Ann CISSELL?]

Elizabeth WISEMAN, SM Co., 25 Oct. 1762, 20 Feb. 1763 To son John. To dau. Ann VANRISHWICK & to grandch. Monica & Wilford VANRISHWICK. To son Richard, ex., and his son Robert. To dau. Elizabeth DOWNIE. To dau. Mary LEIGH & granddau. Peggy LEIGH.

John RESWICK, St. Mary's Co., Gent., 18 Nov. 1766, 5 Mar. 1767. To ch. Thomas, Joseph, Francis, Elizabeth, & Mary, dw. plantation, "Brough," & "White Acre." Wf. Appalonia & dau. Elizabeth RESWICK, coexxs. Wit. Bennett HOPEWELL, Edward SPINK, & Joshua SISSELL.

Monica RISWICK, SM Co., d/o Thomas & Ann, 5 Aug. 1773. All to brother Wilford. Wit. Ignatius CISSELL & Jas. TAYLOR.

Abstracts of Balance Books of the Prerogative Court of MD, St. Mary's Co., 30 Oct. 1765, Elisabeth WISEMAN, 4.147. Sureties Jeremiah RHODES & Mark HEARD. Grandch. Monica and Milford {Wilford} VANRISHWICK, Robert WISEMAN (s/o Richard), & Peggy LEIGH. Residue equally to ch. John, Richard (ex.), Mary LEIGH, Ann VANRISHWICK, & Elisabeth DOWNIE.

Robt. BARNES' MD M, St. Mary's Co., RISWICKE, Thos., 27 July 1773, Mary NOTTINGHAM [Newtown, by Rev. WALTON, S. J., publ. in MD Hist. Mag., Je. 1956]. JOURDAN says this Thomas was the son of Thomas Van RISHWICK & Mary Ann CISSELL.

BRUMBAUGH's MD Records...St. Mary's Co. Marriage Licenses,
RISWICK, Eliz., 19 Oct. 1801, Francis HOWARD
RESWICK, Monica, 13 Je. 1805, Solomon JONES
Wm., 6 Feb. 1806, Nancy THOMPSON
Ann, 5 Apr. 1809, Wm. SMITH
Cecelia, 9 Feb. 1810, Zachar. SPALDING
VAN RESWICK: Tho., 10 Oct. 1820, Juliet ABELL
Joseph, 16 Apr. 1849, Mary E. SIMMS.

Early Fam/o S. MD, by Elise G. JOURDAN: Thomas CISSELL (by 1670 - by 1724, s/o Mary SHIRTCLIFFE & John CISSELL) owned 50 acres of "White Acre," m. Frances, whose inventory of 16 Mar. 1732 named administrators & next of kin son John CISSELL & Thomas VANRISHWICK. Estate of John CISSELL (ca. 1690 - 1743) went to wife Sarah & ch. Thomas, John, & Mary Ann CISSELL. Thomas & John B. RESHWICK were next of kin.

--not my family