Parents of a non-birth child — a Gramps filter rule

A custom person filter rule for Gramps that matches people who are a parent in a family where a child is recorded with a relationship other than "Birth" to them — adoptive parents, foster parents, step-parents, sponsors or a custom type.

Biological parents are not included. In Gramps the child relationship type is stored separately for the father and the mother on each child reference, so the rule only looks at the person's own role:

Situation	Child's relationship	Matches
Foster family	Foster to both parents	both foster parents
Step family	Birth to mother, Stepchild to father	only the stepfather
Birth family	Birth to both	nobody (through that child)

It is the companion of "People recorded as a non-birth child" (HasNonBirthChildRelation), which lists the children themselves.

Requirements

Gramps 5.1 or higher.

Installation

Close Gramps.
Extract the downloaded ZIP archive.
Copy or extract the project folder into your Gramps user plugin folder. Keep the complete folder structure unchanged, including any locale folder included with the project.

The user plugin folder is normally located here:
- Windows: %AppData%\gramps\gramps<version>\plugins\
- Linux: ~/.gramps/gramps<version>/plugins/
- macOS: ~/Library/Application Support/gramps/gramps<version>/plugins/
Replace <version> with the Gramps version folder used on your system.
Start Gramps again.
Check that the installed filter, rule, gramplet or tool is available where described in the project documentation.

If the project does not appear or fails to load, check Help → Plugin Manager for an error message.

Removing the test version

Close Gramps.
Delete the project folder that you added to the Gramps user plugin folder.
Start Gramps again.

Because the project was installed only in the user plugin folder, removing that folder removes the test installation without changing the original Gramps program files.

Usage

In a person view, open Edit → Person Filter Editor.
Add a filter and click Add to add a rule.
Under Family filters, choose "Parents of a non-birth child".
In the Child relationship type drop-down pick:
- (any non-birth) to match every non-birth relationship, or
- a single type (Adopted, Foster, Stepchild, Sponsored, None, Unknown or one of your own custom types) to narrow the list.
Click OK.

Notes

A person who is the biological parent of one child and the step-parent of another will match, because of the step relationship.
The rule relies entirely on correctly set relationship types. In Gramps the default for a new child is "Birth", so a foster or step relationship that was never changed will not be found. Use HasNonBirthChildRelation to review them.
The drop-down stores the language-neutral keyword, so a saved filter keeps working if the interface language is changed.

License

GNU General Public License, version 2 or later — same as Gramps. See LICENSE.

Translations (i18n)

This addon ships with a Danish translation and is ready for more languages. Layout:

<addon folder>/
  *.py  *.gpr.py
  po/
    template.pot          # all translatable strings (source)
    da-local.po                 # Danish translation (source)
  locale/
    da/LC_MESSAGES/addon.mo   # compiled Danish catalog (used at runtime)

Gramps loads locale/<lang>/LC_MESSAGES/addon.mo automatically when the interface is set to that language, and falls back to English otherwise. The .mo filename must be exactly addon.mo.

To add another language, e.g. German:

Copy po/template.pot to po/de.po and translate each msgstr.
Compile it to locale/de/LC_MESSAGES/addon.mo. With GNU gettext: msgfmt po/de.po -o locale/de/LC_MESSAGES/addon.mo (or use the Python polib package: pofile('po/de.po').save_as_mofile(...)).
Restart Gramps.

Only strings unique to this addon are translated here; standard Gramps terms (category names, "ID:", the relationship-type names in the drop-down, etc.) come from Gramps' own translations automatically.

PROJECT WEBSITE

https://myown-project.dk/