The majority of the immigrants who were brought over by DuPont were relatives or friends of the company's powder yard employees. In the first phase of immigration, more men than women came to the Brandywine with an average age of about 15 and 30. As these workers settled into the community, they began to bring over their wives, children and siblings in a process historians have termed "chain migration."
The majority of immigrants who arrived during the second phase of immigration were still young, but women began to slightly outnumber the men. By the third phase of immigration, during the famine years, the gender distribution had become almost equal, but a shift had taken place in the types of parties arriving. Rather than single individuals or the groups of two or three siblings or cousins that had dominated the earlier phase of immigration, whole families began to emigrate together. This trend led to a marked increase in the number of young children as well as the number of people over the age of forty.