Rebecca Kerkenring is the mother of Alida Kok, wife of Johan Hendrik Scheffers of Tecklenburg

Johan Hendrik Scheffers was born in Tecklenburg. His death certificate mentions parents, but the 'mother' mentioned was actually his mother-in-law^*, so we don't have a clue about who his German parents were. 

Alida Kok and Johan Hendrik Scheffers were married in 1775 in Rotterdam

Johan Hendrik was living in the Vierwindestraat in Rotterdam when he married Alida Kok on 7 November 1775 in Rotterdam. She was baptised on 7 May 1747 in Rotterdam as daughter of Tieleman Kock and Rebecca Kerkenring who were married on 22 May 1741 in Rotterdam. The witness at Alida's baptism was an earlier Alijda Kock. She also witnessed the baptism of Alida's younger sister Teuna on 26 December 1751 in Rotterdam. Teuna and Alida had an elder sister named Reijmpje and brothers David, Jan, Jacob and Gerrit.
Alida's mother Rebekka Kerkenring was baptised on 31 August 1719 in Rotterdam as daughter of David Kerckering (†1729) and Reijmpje Stierman (1685-1733) with witnesses Jan Stolck and his wife Rebecka de Swart.
As a widower Tieleman Kok filed for marriage with the widow Cornelia Kient on 14 June 1768 in Cool (now part of Rotterdam).

Alida Kok and Johan Hendrik Scheffers are the parents of

1. Johannes was baptised on 13 February 1776 in Rotterdam with witness Alida Cornelia Walravens. He may have died young, and may have been buried on 4 May 1776 in Rotterdam.
2. Johannes was baptised on 6 July 1777 in the Zuiderkerk church in Rotterdam with witness Alida Cornelia Walravens.
3. Alida was baptised on 4 June 1780 in the Zuiderkerk church in Rotterdam with witness Teuna Kock. Alida Scheffer married Nicolaas Pannekoek on 18 December 1811 in Rotterdam. Alida Scheffer died on 29 June 1852 in Rotterdam at the age of 72.

Hendrik Scheffers, husband of Alida Kok, died on 27 March 1816 in Rotterdam. Alida Kok, widow of Hendrik Scheffers, died on 17 February 1828 in Rotterdam, aged "81 years, 9 months and 12 days", but she was actually one year younger.

^*Several websites on the Internet wrongly present his mother-in-law as his mother.
Source: StadsArchief.Rotterdam.nl.