Cross-platform video conversation between related devices is described. Techniques described herein include receiving, by a first device registered with a network to utilize a communication address for sending and receiving cellular communications via the network, live video associated with a video conversation between the first device and a second device. Information for related device(s) may be retrieved by the first device. The related device(s) may be related to the first device based on utilizing the communication address for sending and receiving at least communications via the network and/or being associated with a same subscriber account as the first device. Moreover, techniques described herein enable the first device to share the live video with related device(s) to enable the related device(s) to join the video conversation irrespective of which computing platform provides conversational video services for each of the related device(s).