Gisele Bündchen posted a birthday message to her sister with a photo from the wedding to Tom Brady

Tom Brady and Gisele Bündchen arrive at the 2019 Hollywood For Science Gala at Private Residence on February 21, 2019 in Los Angeles, California.

George Pimentel/Getty Tom Brady and Gisele Bundchen

Gisele Bündchen posted a birthday message to her Instagram story on Sunday to honor her sister, Graziela Nonnenmacher Bündchen.

“Happy birthday to a true angel on earth! I love you so much sister!” said the message, translated from Portuguese.

The photo shows Bündchen’s sister Graziela, in blue, hugging the Brazilian supermodel, 42, as Gisele pulls a funny face with one leg kicked up. Gisele used Instagram stickers to make it look like she was holding a birthday cake and added animated hearts to the photo.

The birthday post comes as sources tell PEOPLE that Bündchen and Brady have been on “bad footing” in their marriage.

13598535. Sister Gisele's birthday.  Gisele Bundchen/Instagram

13598535. Sister Gisele’s birthday. Gisele Bundchen/Instagram

Gisele Bundchen/Instagram

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Brady and Gisele — who have son Benjamin Rein, 12, and daughter Vivian Lake, 9, along with son General John “Jack” Edward, 14, who he shares with ex Bridget Moynahan — are married for 13 years after meeting through friends. . The couple married a month after getting engaged in an intimate ceremony on February 26, 2009, at St. Monica’s Catholic Church in California.

Sources have revealed to PEOPLE that the couple is at odds over the Tampa Bay Buccaneer quarterback’s decision to play another season in the NFL — a choice that has led to “a lot of tension” between the longtime couple.

Over the Labor Day weekend, Brady and Gisele were seen spending time apart. Sources told PEOPLE that the supermodel took Benjamin and Vivian to a water park in Florida, while Brady flew to New York to watch son Jack practice soccer.

Gisele was “not thrilled” with her husband’s decision to end his retirement from professional football earlier this year after just two months, a source close to Brady tells PEOPLE.

“They’re hitting a rough patch,” the insider continued. “But I know he’s trying, or at least he’s trying, to figure it out and make it work. He wants to get over it and make things better.”

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A Buccaneers source told PEOPLE that preparations are not being made for Gisele to attend her husband’s first game of the season on Sunday.

“It’s always great when Gisele comes to watch the match. [but] as of now, there is none of that for Sunday’s game,” the source said.

“She feels very different this year than last year. She was excited to be here, we saw her around,” the source continued. “I’m not saying he can’t come, but nothing is right for him to be here for the first game of the regular season and that seems strange.”

RELATED VIDEO: Tom Brady and Wife Gisele Bündchen ‘Hitting a Rough Patch’ in Marriage: ‘There’s a Lot of Tension’

The insider added that people don’t bring Gisele around Brady.

“Everyone here knows there’s tension, but we don’t know how serious it is. So we just don’t talk to him about Giselle. It’s not a topic anyone wants to bring up.”

Rumors of a rift between the pair grew when Brady was excused from practice with the Buccaneers last month “to deal with some personal things,” head coach Todd Bowles said during a news conference at the time. According to Bowles, Brady and the team discussed the absence before the start of training camp in July.

RELATED: Tom Brady and Wife Gisele Bündchen ‘Hitting a Rough Patch’ in Marriage: ‘There’s a Lot of Tension’

Brady spoke about his absence from the team after finally returning 11 days later.

“Everybody has different situations that they deal with and we all have unique challenges in our lives,” Brady told reporters. “I’m 45 years old, man.”

“There’s a lot – going on, so you just have to try to find life as best you can. You know, it’s an ongoing process,” he continued.

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