Gregers var født 7/3 1721 på Herrebrøden og døpt 17/3. Han var umyndig ved farens død, men myndig før skiftets avslutning. Han døde 10/12 1799 på Fredrikshald, hvor han bodde i sine senere år. Et meget fint malt miniatyrportrett av ham i medaljong er bevart. Det er datert 1819 og er vel da kopi av et originalt større maleri av ham som yngre. Han har et markert fint ansikt med en stor, men velformet nese, ikke den store utstående, buklete nese som bestefaren. Ovenstads militærbiografier inneholder opplysninger om hans militære løpebane. Den 22. august 1788 tok han avskjed med majors karakter. Han var knyttet til Rakkestad kompani og bodde i Rakkestad til leie på gården Haugsten som tilhørte kanselliråd og sorenskriver Hieronymus Bassøe.

14.-25. september 1777 møttes kaptein Smidts Rakkestadske kompani til regimentseksersis på Hafslund-moen. Han har vel da truffet den unge datter til bruksfoged Johannes Berg på Hafslund og Annichen Strømberg. Hun het Ingeborg Cathrine og var døpt i Tune 24/2 1757. Hun ble begravet på Fredrikshald 19/9 1822. Også av henne eksisterer et meget fint miniatyrportrett. I september 1773 fikk han giftetillatelse og bryllupet stod på Hafslund 18/2 1779. Som enke kjøpte hun Store Holm i Idd og bodde der, men sine siste år tilbragte hun i Fredrikshald. Gregers Smidt brukte som sin bestefar og delvis sin far seglet med griffen.

Gregers Smidt og Ingeborg Cathrine Berg hadde følgende barn, alle døpt i Rakkestad:

1. Karen Johanne Smidt f. 7/8 1784, døpt 13/8, gift 21/10 1803 med Christian Nørbech, kjøpmann på Fredrikshald, som døde i Kristiania 3/9 1852. Hun døde i Kristiania 5/12 1871.
2. Petrine Antonette Smidt f. 19/3 1787, hjemmedåp stadfestet 7/3. Hun ble gift 1810 med proprietær Peter Myhre i Glemmen.
3. Johanne Cathrine Maren Smidt f. 11/8 1789, hjemmedåp stadfestet 26/7.
4. Friedrich Smidt f. 12/11 1790, døpt 24/11, gift 10/1 1817 i Idd med Charlotte Cathrine Linde. Han eide og bodde på Store Holm.
5. Hans Strømberg Smidt f. 1/2, døpt 10/2 1792, gift med Abigael Margrethe Kielland. Han var skipskaptein.
6. Peter Smidt f. 22/5 1795. Han ble umyndiggjort. Skifte etter ham fant sted 17/3 1845.

Gregers was born on March 7 1721 at Herrebrøden and baptized March 17. He was under aged when his father died, but of age by the end of the probate proceedings. He died on December 10 1799 at Fredrikshald, where he lived his last years. A very finely painted miniature medallion portrait of him still exists. It is dated 1819, and must be a copy of a larger original paining of him as a young man. He has a distinct and handsome face with a large, but well shaped nose, not the protruding and bumpy nose of his grandfather. Ovenstad's military biographies contain information about his military career. He has the rank of Major when he resigns on August 22 1788. He was connected to the Rakkestad company and lived as tenant at the Haugsten farm, which belonged to chancellor and district stipendiary magistrate Hieronymus Bassøe.

Captain Smidt's Rakkestad company met at the Hafslund fields, on September 14 to 25 1777, for regiment exercises. This is when he must have met the young daughter of the Hafslund industry bailiff Johannes Berg and Annichen Strømberg. Her name was Ingeborg Cathrine and was baptized in Tune on February 24 1757. She was buried at Fredrikshald on September 19 1822. There also exists a fine miniature portrait of her. Gregers received his permission to marry in September 1773 and the wedding was held at Hafslund on February 18 1779. Ingeborg bought Store Holm at Idd when she was widowed, and lived there until her last years, when she moved to Fredrikshald. Gregers Smidt used, like his grandfather and sometimes his father, the griffin seal.

Gregers Smidt and Ingeborg Cathrine Berg had the following children, all baptized in Rakkestad:

1. Karen Johanne Smidt born August 7 1784, baptized August 13, married October 21 1803 to Christian Nørbech, storekeeper at Fredrikshald who died in Kristiania September 3 1852. She died in Kristiania December 5 1871.
2. Petrine Antonette Smidt born March 19 1787, baptized at home, recorded March 7. Married 1810 to landowner Peter Myhre at Glemmen.
3. Johanne Cathrine Maren Smidt born August 11 1789, baptized at home, recorded July 26.
4. Friedrich Smidt born November 12 1790, baptized November 24, married January 10 1817 at Idd to Charlotte Cathrine Linde. He owned, and lived at, Store Holm.
5. Hans Strømberg Smidt born February 1, baptized February 10 1792, married to Abigael Margrethe Kielland. He was shipmaster.
6. Peter Smidt born May 22 1795. He was declared incapable of managing his own affairs. His probate proceedings took place on March 17 1845.