Creating children in QtreeWidget with SQL data

[sam123]

Hello
I have two tables in SQL database and 1st table I have created as a parent In QtreeWidgit using QtreeWidgetItems now I have to add children in parents items respectly, here is the example

table1

Name

1. Marcus
2. Andreas
3. Jacop

table 2

Column 1
Devices

1. Laptop
2. Cell Phon
3. Pc
4. Laptop
5. PC
6. Cell Phon

Column 2
Name

1. Marcus
2. Marcus
3. Marcus
4. Andreas
5. Andreas
6. Jacop

Here table 1 is my parent items and table 2 has two column first is my children items and second I have given for the reference.
Now I have added parent in my QtreeWidget using QtreeWidgetItem but I am not able to add children saperatly.

Main problem I am getting is, Wheneever I add children, All children were added In each parent .

Looking for your advise
Thanks in advance.