SSG finally responded to my help ticket several weeks ago. I had been e-mailing SSG weekly trying to get a response/action.

The admin managed to "sell" the kinship houses that were blocking transfer off Ithil for this and two other family accounts stuck on Ithil

We were able to successfully transfer characters from Ithil to Anor

Several issues noted:

1) Premium Belfalas Kinship Houses - got 80% of the Kinship House value in Premium Housing Writs
2) Premium Belfalas Houses - got 0% of the House value in Premium Housing Writs (had 5 houses worth at total of ~90 Premium Housing Writs). Other family members had 5 houses worth 85 Housing Writs
3) 90% of Housing Decorations appear to have transferred correctly. Certain items purchased at various festivals did NOT successfully transfer. Notably, all items purchased with Figments or Motes did transfer and did get refunded to the correct accounts.

Above issues were common to all three accounts. Each account also had some unique issues related to the transfer of housing items. The losses of decorations does NOT appear to be "house" specific. For some items earned by Deed completion and placed in one of the Premium Kinship or Premium Houses, most items transferred but one or two got "lost" (i.e. 5 alts earned the Deed item, but only 3 or 4 were transferred)

I have had a new help ticket in for ~2 weeks with details of the issues documented, with no response yet.