Hi Deborah,
The only right date in your profile is the marriage of Reiner Jansen, living near Franeker, Friesland, The Netherlands, who married in Franeker 7 April 1712 with Trijntie Romkes, also living near Franeker. You find this record on the website allefriezen.nl. Four of their children were baptized in the catholic church of Franeker (son Romken/Romannus 6 August 1721, daughter Sipk 6 september 1723 and another Sipk/Cipriana 16 February 1726 and daughter Jancke 13 December 1729. There are no catholic baptism records of Franeker before 1719, so you won't find a son Jan.
Reiner/Reinder/Reyndert Jans(en) never used the surname Kalksma. His descendants started using this surname after people had to take a surname in the Netherlands in 1811. Before 1811 many people in the province of Friesland used patronymics.
Reyndert Jans can't be born about 1750 and he didn't pass away about 1820 because he married in 1712. He's probably mentioned in the census (volkstelling) 1744, living in the Uitburen in Franeker. He probably passed away before 1749 because the widow of Reinder Jans, who was a worker, is mentioned in the Quotisatiekohieren of Franeker in 1749, still living in the Uitburen in Franeker.
Not all sources are on the website allefriezen.nl, so I don't know if there is more information about this family in Tresoar, the Archives of the province of Fryslân, The Netherlands.