Yes, you can make an application to the Tribunal to order your children or relatives to pay you temporary maintenance (on a monthly basis). The Tribunal has to decide on whether you can get temporary maintenance within 90 days of informing your children or relatives of your application (through a notice). In special circumstances, they can delay this for some more time (i.e., 30 days).
This is not the final maintenance you can expect to get. The Tribunal may decide not to give you maintenance at all or may decide to increase or decrease the amount of maintenance in the final order.