Whoops! Well I just replied but it's been so long since I came back to 
Google Groups that I forgot to use Reply All vs. Reply to Author... 
hopefully that message still made it to you! (normally I only 
monitor https://talk.tiddlywiki.org/ these days) - sorry about that.

On Sunday, November 7, 2021 at 6:17:23 AM UTC-5 [email protected] wrote:

> Hello!
>
> Okay, so the context for this is that I have, or will have, a database of 
> many, many interrelated individuals. Each of those individuals has a 
> 'mother' and a 'father'. I can currently get tiddlywiki to display lists of 
> children each individual has, based on their name showing up in the mother 
> or father field of another tiddler. What I can't figure out how to do is 
> get the 'Children' row of the table not to show when an individual has no 
> children. 
>
> For other fields I can do something like this:
> <$list filter="[all[current]has[secondaryeducation]]">
>   <tr>
>     <td>''Secondary Education''</td>
>     <td><$link to={{!!secondaryeducation}} /></td>
>   </tr></$list>
>
> When an individual doesn't have the secondaryeducation field, the row 
> doesn't show up in the sidebox.
>
> My current set up for listing children looks like this
>
> <$list filter="[all[current]gender[female]]">
>   <tr>
>     <td>''Children''</td>
>     <td><<list-links [field:mother{!!title}]>></td>
>   </tr></$list>
> <$list filter="[all[current]gender[male]">
>   <tr>
>     <td>''Children''</td>
>     <td><<list-links [field:father{!!title}]>></td>
>   </tr></$list>
> <$list filter="[all[current]has[id]]">
>
> If the individual is female, it looks for instances of the title of the 
> individuals tiddler being listed as the mother in other tiddlers. Vice 
> versa for males. 
>
> I've fiddled with lots of widgets. I think the problem is that this syntax 
> [field:father{!!title}] doesn't play well...
>
> Also, if you have better alternative methods of achieving this goal, I'm 
> all ears! I know filling in a 'Children' field, would solve this problem, 
> but I want to cut manual data input to a minimum, and in principle all 
> biological familial relationships (siblings, aunts, grandparents...etc.) 
> can be expressed in mother-child, and father-child relationships.
>
>

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