i have airport extreme 1143 , express 1088 and express 1264 , help required ?

For streaming it is NOT necessary for either Express base station to extend the wireless range of the "main" AirPort Extreme. Instead, you would want to configure both Express base stations to "join" the Extreme's wireless network.

If on the other hand you DO want to BOTH extend the Extreme's Wi-Fi range AND stream iTunes, I would suggest that you only use the 802.11n Express for extending/streaming and the 802.11g Express only for streaming.

Remember "join" and "extend" are two different things. If you want to use the A1264 Express to extend the Extreme's wireless network, please follow these Apple Support article directions. This extended network will also support iTunes streaming.

The older A1088 Express does not support the 802.11n's extend feature. Instead it would require that the network be configured for a Wireless Distribution System (WDS). This type of extended network has two major disadvantages: 1) It can only operate in the 802.11g Radio Mode, and 2) For every base station added to the WDS, the overall bandwidth of the network would be cut in half. So, for example, if you use all three of your AirPorts in a WDS, you would only be getting around 13-14 Mbps. The same roughly as an 802.11b network. I would not recommend going with a WDS and why I suggested that you only use the A1264 Express for extending. You could still use the A1088 for streaming by having this base station "join" the extended wireless network created by the other base stations.

This would be the makings of a WDS network. It doesn't matter in which order (main, relay, or remote) you use the three base stations. You would still get the significant bandwidth reduction implementing this configuration and I would recommend against it.