They had two children, Adolf Ulric, collector and natural scientist, and a daughter named Anna Johanna 1745–1801), who donated The Conspiracy of Claudius Civilis to the Royal Swedish Academy of Fine Arts.

The Anglo-Swedish company run by Andrew & Charles Lindegren in London handled all the exports, shipping documents, vessel clearances, and insurance for the Grill Trading House.

Imports consisted of salt from Portugal, oak and hemp from the Baltic states, also wine, coffee, sugar, cheese, tobacco and textiles.

[8] Grill ran his companies in an old-fashioned, patriarchal way writing letters every week to his managers at the estates concerning everything from the running of the factories to making enquiries about individual employees.

[3] Grill was an art collector and his houses were decorated with Chinese objects as well as paintings by Swedish and Dutch masters like Alexander Roslin, Gustaf Lundberg, Hans Memling and David Teniers.

[3] Imported porcelain broken in transit from China or by daily household use became decorative gravel used on the garden paths at one of the Grills' estates.

He wrote: "A part of the silver, which withstands the wear and tear of time and which even fire cannot destroy, we exchange for fragile objects of clay, which, once dropped, cannot be mended.

"[9] Grill was interested in natural science and contributed to different projects, such as helping Carl Linnaeus financially and with the collection of plants and animal specimens from foreign lands.

He was also one of the partners in the infamous Växelkontoret (Exchange office), a private financial institution handling mainly promissory notes without the involvement of the central bank.

When the Caps became the ruling party in 1765, Grill, along with his half-brother Johan Abraham and all the other members of the Växelkontoret, were accused of corruption and mishandling its affairs.